Satellites were launched （） low orbit for weather and military applications.A、onB、aroundC、inD、with
Satellites were launched （） low orbit for weather and military applications.
- A、on
- B、around
- C、in
- D、with
相关考题：
109 Problems can occur in properly defining a project because:A. Project goals may not be agreeable to all partiesB. The plan was "too loose," thus allowing priorities to changeC. Low turnover of project personnelD. Too much communication between the client and project personnelE. The project objectives were quantified
● Problems can occur in properly defining a project because:A Project goals may not be agreeable to all partiesB The plan was "too loose," thus allowing priorities to changeC Low turnover of project personnelD Too much communication between the client and project personnelE The project objectives were quantified
Now satellites are 36 to forecast（预报）the weather. They are in space, and they can 37 any part of the world. The satellites take pictures of the atmosphere（大气），38 this is where the weather forms（形成）. They send these 39 to the weather stations. So meteorologists（气象学家）can see the weather of any part of the world. From the pictures, the scientists can often say 40 the weather will change.Today, nearly five hundred weather stations in sixty countries receive satellite pictures. When they receive new pictures, the meteorologists compare them with earlier 41 . Perhaps they may find that the clouds have changed during the last few hours. This may mean that the 42 on the ground may soon change, too. In their next weather forecast, the meteorologists can say this.So the weather satellites are a great 43 to the meteorologists. 44 __satellites were invented, the scientists could forecast the weather for about 24 or 48 hours. Now they can make good forecasts for three or five days. Soon, perhaps, they may 45 forecast the weather for a week or more ahead（提前）.36.________________A. help B. to help C. helped D. helping
Parts were ordered only as needed, keeping () and overhead low. A、inventoryB、sacrificeC、drippingD、clear-cut
In their hiding place, the criminals lived in fear(). They knew the police were searching high and low for them. A、again and againB、all the time
Nother matter how low you consider yourself ,there is always someone _________you wishingThey were that high.A. getting rid ofB. getting along withC. looking up toD. looking down upon
Wheat prices were generally low in the autumn, so farmers could not wait for markets to improve.(语法上正确与否)() 此题为判断题(对，错)。
根据下列材料请回答 31～35 题：ANow satellites are helping to forecast the weather．They are in space，and they can reach any part of the world．The satellites take pictures of the atmosphere(大气)，because this is where the weather form．They send these pictures to the weather stations．So meteorologists(气象学家)can see the weather of any part of the world．From the pictures，the scientists can often say how the weather will change．Today，nearly five hundred weather stations in sixty countries receive satellite pictures．When they receive new pictures，the meteorologists compare them with earlier ones．Perhaps they may find that the clouds have changed during the last few hours．This may mean that the weather on the ground may soon change，too．In their next weather forecast，the meteorologists can say this．So the weather satellites are a great help to the meteorologists．Before satellites were invented，the scientists could forecast the weather for about 24 0r 48 hours．Now they can make good forecasts for three or five days．Soon，perhaps，they may be able to forecast the weather for a week or more ahead．第 31 题 Satellites travel______．A．in spaceB．in the atmosphereC．above the groundD．above space
Why do we use the weather satellites to take pictures of the atmosphere?Because______．A．the weather satellites can do it easilyB．clouds form. thereC．the weather forms thereD．the pictures can forecast the weather
Satellites were launched（）low orbit for weather and military applications.A．on B．around C．in D．with
The discount houses were first established in that period of time ________ people‘s purchasing power was low. A. which B. that C. when D. where
The Moon and most artificial satellites travel around the Earth in elliptical paths．A: wavesB: orbitsC: voyagesD: flights
Which of the following is a diplexer used for？（）A、Allows two satellite tuners to use the same dish.B、Connects the low noise block down converter （LNB） to the multi-switch.C、Combines satellite and over the air （OTA） signals.D、Allows one LNB to use two satellites.
单选题According to the passage, cell phones were launched _____.Ain the late 1970sBbetween 1980 and 1985Cin the late 1980sDin the early 1990s
单选题If a davit-launched liferaft aboard a ship cannot be launched because of damage to the davit，you should（）.Ainflate the liferaft on deckBroll the liferaft over the sideCgo to another liferaft stationDget a saw and cut the liferaft free
单选题If a refrigeration compressor were short cycling on the low pressure cutout switch, the probable cause for this might be the （）.Asystem was overcharged with refrigerantBhigh pressure switch was improperly adjustedCexpansion valve strainers were fouledDsuction valves were leaking slightly
单选题If a refrigeration crankcase compressor were short cycling on the low pressure cutout switch, the cause might be that the （）.Asystem was overcharged with refrigerantBsystem was low on refrigerantCsuction valves were leaking slightlyDrelief valve was leaking slightly
单选题Which of the italicized parts functions as a complement（补语）?AWe were greatly encouraged by the news of China’s having launched another man-made satellite.BHis wish is everyone’s having a good time.CI saw an old man getting on the bus.DThe smiling boy needs a pen bought by his mother
单选题The receiver uses（）satellites to compute latitude，longitude，altitude，and velocity．AoneBtwoCthreeDfour
单选题Satellites were launched （） low orbit for weather and military applications.AonBaroundCinDwith
单选题Passage3 Questions 11 to 15 are based on the following passage. Many of the most damaging and life threatening types of weather, such as torrential rains and severe thunderstorms, begin quickly, strike suddenly, and disappear rapidly, destroying small regions while leaving neighboring areas untouched. (79) Conventional（普通） computer models of the atmosphere have limited value in predicting short-lived local storms because the available weather data are generally not detailed enough to allow computers to see clearly the small atmospheric changes that come before these storms.In most nations, for example, weather-balloon observations are taken just once ever3r twelve hours at location typically separated by hundreds of miles. With such limited data, conventional forecasting models do a much better job predicting general weather conditions over large regions than they do forecasting specific local events. Until recently, the observation-intensive approach needed for accurate, very short range forecasts, or nowcasts, was impracticable. The cost of equipping and operating many thousands of conventional weather stations was extremely high, and the difficulties involved in rapidly collecting and processing the raw weather data from such a network were beyond overcoming.Fortunately, scientific and technological advance have overcome most of these problems. Radar systems, automated weather instruments, and satellites are all capable of making detailed, nearly continuous observations over large regions at a relatively low cost. Communication satellites can transmit data around the world cheaply and immediately, and modern computers can quickly compile and analyze this large volume of weather information. (80) Meteorologists（气象学家）and computer scientists now work together to design computer programs and video equipment capable of transforming r.aw weather data into words, symbols, and vivid graphic displays that forecasters can interpret easily and quickly. As meteorologists have begun using these new technologies in weather forecasting offices, nowcasting is becoming a reality.13 Nowcasts used to be impracticable because______.Athere were no conventional computersBthe cost of the equipping and operating was sky-highCthere were no difficulties in data processingDthere were not enough meteorologists
填空题Animal welfare was a low-rated trust factor partly because consumers were reluctant to pay extra money for “animal friendly” products.____
单选题Geostationary satellites are the artificial satellites which（）.Aalways move slowlyBare in one place onlyCsometime move sometime don‟t moveDare synchronizing with the movement of the earth
单选题Which statement about satellite navigation is TRUE? （）AWhile a fix can be generated by signals received from two satellites，three satellites are necessary for reliable accuracyBThe satellites are in equatorial orbits around the earth about 60°of longitude apartCThe satellite navigation system determines a fix by measuring the doppler shift of the radio signals from the satelliteDThe ship's receiver cannot begin processing data until the antenna locks onto the satellite and starts continuous tracking
单选题People waited outside Apple stores early, because ______.Athey could get a gift when the store openedBthey wanted to own the iPad as early as they canCthe price of the iPad was low at firstDthere were a few iPads on sale