Which statement concerning carbon dioxide is FALSE ________．A.It displaces the oxygen in the airB.It cannot be seenC.It cannot be smelledD.It is safe to use near personnel in a confined space
Which statement concerning carbon dioxide is FALSE ________．
A.It displaces the oxygen in the air
B.It cannot be seen
C.It cannot be smelled
D.It is safe to use near personnel in a confined space
相关考题：
Carbon dioxide as a fire fighting agent has which advantage over other agents?A.It causes minimal damageB.It is safer for personnelC.It is cheaperD.It is most effective on a per unit basis
Which statement is TRUE concerning the flash point of a substance ________．A.It is lower than the ignition temperatureB.It is the temperature at which a substance will spontaneously igniteC.It is the temperature at which a substance，when ignited，will continue to burnD.It is the temperature at which the released vapors will fall within the explosive range
Which statement about entry into a space that has been sealed for a long time is TRUE ________．A.A tank that has been used to carry hazardous liquids should be tested for oxygen content，toxicity，and explosive gasesB.You can safely enter the space without a breathing apparatus if the oxygen content exceeds 14%C.The natural ventilation through the installed vents is sufficient to provide the proper oxygen contentD.The heat of the sun on upper ballast tanks，such as in a bulk carrier，may generate carbon monoxide
Which statement is TRUE concerning the placard entitled Discharge of Oil Prohibited ________．A.It is required on all vesselsB.It may be located in a conspicuous place in the wheelhouseC.It may be located at the bilge and ballast pump control stationD.All of the above
What could result in an incorrect oxygen concentration reading on the oxygen indicator ________．A.Exposure to carbon dioxide for no more than 1 minuteB.Exposure to carbon dioxide for more than 10 minutesC.Exposure to a very low concentration of sulfur dioxide for no more than 2 minutesD.None of the above
Which statement concerning GPS is TRUE ________．A.It cannot be used in all parts of the worldB.There are 12 functioning GPS satellites at presentC.It may be suspended without warningD.Two position lines are used to give a 2D fix
Which statement concerning locating signals in the GMDSS is FALSE ________．A.Locating signals are transmitted by survival craft VHF transceiversB.Locating signals are transmitted by SARTsC.Locating signals are intended to facilitate the finding of a distressed vessel or its survivorsD.Locating signals are not transmitted by autoalarm generators
Which statement concerning the application of dry chemical powder is FALSE ________．A.At temperatures of less than 32℉，the extinguisher must be recharged more oftenB.When possible，the fire should be attacked from windwardC.The stream should be directed at the base of the fireD.Directing the stream into burning flammable liquid may cause splashing
You are underway with a tow consisting of six barges containing hazardous chemicals．Which statement is FALSE concerning a cargo information card ________．A.It must be carried in the pilothouse，readily available for each chemical carriedB.It must be posted on the lead barge of the tow onlyC.It must be posted on each barge on the towD.It contains information on procedure for spills or leaks
______, as the chemical extinguisher agent, should be used for an electric fire.A.dry chemical or foamB.foam or soda acidC.carbon dioxide or foamD.carbon dioxide or dry chemical
As compared to carbon dioxide, dry chemical has which advantage? ______.A.CleanerB.Effective on metal firesC.Greater rangeD.More cooling effect
An Essential Scientific ProcessAll life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet. 词汇：nutrient n.营养物 ganism n.生物体，有机体carbon dioxide n.二氧化碳chloplast n.叶绿体molecule n.分子vap n.水蒸气oxygen n.氧气 photosynthesis n.光合作用chlophyll n.叶绿素glucose n.葡萄糖cease v.停止 注释：1.Then animals feed upon the plants.动物以植物为食。 练习：5.Another good title f this passage would beA.Oxygen Carbon Dioxide.B.Plants Their Roots.C.How Photosynthesis Wks.D.Why Our Earth Needs Water.
An Essential Scientific ProcessAll life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet. 词汇：nutrient n.营养物 ganism n.生物体，有机体carbon dioxide n.二氧化碳chloplast n.叶绿体molecule n.分子vap n.水蒸气oxygen n.氧气 photosynthesis n.光合作用chlophyll n.叶绿素glucose n.葡萄糖cease v.停止 注释：1.Then animals feed upon the plants.动物以植物为食。 练习：4.This passage is primarily developed byA.explaining a process.B.telling a sty.C.comparing contrasting.D.convincing the reader of plants’ imptance.
An Essential Scientific ProcessAll life on the earth depends upon green plants. Using sunlight, theplants produce their own food. Then animals feed upon the plants. They take inthe nutrients the plants have made sted. But that’s not all.Sunlight also helps a plant produce oxygen. Some of the oxygen is used by theplant, but a plant usually produces me oxygen than it uses. The excess oxygenis necessary f animals other ganisms to live.The process of changing light into food oxygen is calledphotosynthesis. Besides light energy from the sun, plants also use water carbon dioxide. The water gets to the plant through its roots. The carbondioxide enters the leaves through tiny openings called stomata. The carbondioxide travels to chloplasts, special cells in the bodies of green plants.This is photosynthesis takes place. Chloplasts contain the chlophyllsthat give plants their green col. The chlophylls are the molecules thattrap light energy. The trapped light energy changes water carbon dioxide toproduce oxygen a simple sugar called glucose.Carbon dioxide oxygen move into out of the stomata. Watervap also moves out of the stomata. Me than 90 percent of water a planttakes in through its roots escapes through the stomata. During the daytime, thestomata of most plants are open. This allows carbon dioxide to enter the leavesf photosynthesis. As night falls, carbon dioxide is not needed. The stomataof most plants close. Water loss stops.If photosynthesis ceased, there would be little food other ganicmatter on the earth. Most ganisms would disappear. The earth’s atmospherewould no longer contain oxygen. Photosynthesis is essential f life on ourplanet. 词汇：nutrient n.营养物 ganism n.生物体，有机体carbon dioxide n.二氧化碳chloplast n.叶绿体molecule n.分子vap n.水蒸气oxygen n.氧气 photosynthesis n.光合作用chlophyll n.叶绿素glucose n.葡萄糖cease v.停止 注释：1.Then animals feed upon the plants.动物以植物为食。 练习：2.Which of the following does not move through a plant’s stomata?A.Carbon dioxide. B.Water vap.C.Oxygen. D.Food.
单选题As compared to carbon dioxide，dry chemical has which advantage?（）.ACleanerBEffective on metal firesCGreater rangeDMore cooling effect
填空题Glucose can be completely broken down into carbon dioxide and water when oxygen is present in the process called aerobic respiration.____
单选题Which statement concerning the collection of fresh water is FALSE?（）AFresh water may be obtained from fishBlifeboat covers or canopies should be washed with rain before drinking water is collectedCFresh water may be collected from condensation inside the life-raftDFreshwater cannot be produced from standing seawater
单选题Carbon dioxide flooding system is used for extinguishing fires because it reduces the concentration of oxygen in the air to（）.Aflashing pointBcombustion pointCauto-ignition pointDlower explosive limit
单选题Which general statement concerning radar is FALSE?（）.ARaising the antenna height increases the radar rangeBThe ability of radar to detect objects is unaffected by weather conditionsCRadar bearings are less accurate than radar rangesDRadar should be checked regularly during clear weather to ensure that it is operating properly
单选题Which statement is FALSE concerning the interleave depth value？（）AA higher interleave depth provides more protection from burst of noise on the HFC networkBHigher interleave depth increase downstream latencyCLower interleave depth cause some packet loss on typical HFC networksDNone ofthe above
单选题As compared to carbon dioxide,dry chemical has which advantage?（）.ACleanerBEffectiveCGreater rangeDMore cooling effect
单选题Which of the following statements is true concerning carbon dioxide when used as a fire extinguishing agent?（）ACarbon dioxide is corrosive when exposed to fireBCarbon dioxide should be applied slowly to a large engine room fireCIts total cooling effect is far greater than waterDIts smothering effect is excellent for class B fires
单选题Which statement concerning the handling characteristics of a fully loaded vessel as compared with those of a light vessel is FALSE?（）AA fully loaded vessel will be slower to respond to the enginesBA fully loaded vessel will maintain her headway furtherCA light vessel will be more affected by the windDA light vessel lose more rudder effect in shallow water
单选题Which statement concerning locating signals in the GMDSS is FALSE（）.ALocating signals are transmitted by survival craft VHF transceiversBLocating signals are transmitted by SARTsCLocating signals are intended to facilitate the finding of a distressed vessel or its survivorsDLocating signals are not transmitted by autoalarm generators
单选题Which statement is FALSE concerning Concatenation？（）AIt allows ITCM to send multiple upstream packets in one single large burst.BIt reduces upstream data throughput.CIt can be enabled/disabled from CMTS on per upstream port basis if desiredDConcatenation activity on an interface can be checked by the show controller counters command
单选题Which statement concerning the collection of fresh water is FALSE?（）AFresh water may be obtained from fishBLifeboat covers or canopies should be washed with rain before drinking water is collectedCFresh water may be collected from condensation inside the liferaftDSeawater should never be consumed
单选题Why should you wear a self-contained breathing apparatus before entering the engine room after the fixed CO2 system has been discharged to combat a major fire?（）ABecause carbon dioxide dilutes the oxygen concentration in the atmosphere and may cause asphyxiationBBecause carbon dioxide breaks down in a fire into carbon monoxide which may cause blood poisoning in the person breathing this gasCBecause carbon dioxide is a colorless and odorless gas that becomes highly toxic in the presence of high temperatures and will quickly incapacitate a person exposed to this gasDThis action is unnecessary as carbon dioxide is not poisonous nor toxic but is a relatively harmless gas