单选题An electronic depth finder operates on the principle that（）.Aradio signals reflect from a solid surfaceBsound waves travel at a constant speed through waterCradar signals travel at a constant speed through waterDpressure increases with depth
单选题
An electronic depth finder operates on the principle that（）.
A
radio signals reflect from a solid surface
B
sound waves travel at a constant speed through water
C
radar signals travel at a constant speed through water
D
pressure increases with depth
参考解析
解析：
暂无解析
相关考题：
() that store digital certificates are particularyly handy when you shop at a site that. A、None of the aboveB、Electronic checksC、Electronic walletsD、Electronic Cash
在系统预设的状态下,当在Finder窗口中双击其中一个文件夹图标时,将会()。 A.在原Finder窗口中打开并显示该文件夹内容B.创建一个新的Finder窗口并显示该文件夹内容C.在原Finder窗口中打开并显示“个人”目录内容D.创建一个新的Finder窗口并显示“个人”目录内容
狭义的电子商务的英文表达是:()A.Electronic GovernmentB.Electronic BusinessC. Electronic BankingD.Electronic Commerce
In the following statements about the principle of the low level controlling, which is WRONG? 0 A.Low level is monitored on the drain tank and header tank.B.If there is high differential the filters pressure across the circulatingpumps is alarmedC.The lubricating oil purifier cannot take oil from the drain tankD.If the sea water pressure falls, this also operates an alarm
中文“电子商务”一词源于英文的“(25)”。A．Electronic ConsumerB．Electronic CommerceC．Electronic ChangeD．Electronic Communication
The height of tide is the ______.A.depth of water at a specific time due to tidal effectB.difference between the depth of the water and the area's tidal datumC.difference between the depth of the water and the high water tidal levelD.difference between the depth of the water at high tide and the depth of the water at low tide
All echo-sounders can measure the ______．A.Actual depth of waterB.Actual depth of water below keelC.Average depth from waterline to hard bottomD.Average depth of water to soft bottom
A channel is started as having a controlling depth of 38 feet. Which statement is TRUE?_____A.At least 80% of the channel is cleared to the charted depth.B.At least 50% of the channel is cleared to the charted depth.C.100% of the channel depth is clear to 38 feet.D.The sides of the channel conform to at least 50% of the controlling depth.
MIDI enables people to use （请作答此空）computers and electronic musical instruments. There are actually three components to MIDI, the communications"（ ）", the Hardware interface and a distribution（ ）called "Standard MIDI Files". In the context of the WWW, the most interesting component is the （ ）Format. In principle, MIDI files contain sequences of MIDI Protocol messages: However, when MIDI Protocol（ ）are stored in MIDI files, the events are also time-stamped for playback in the proper sequence. Music delivered by MIDI files is the most common use of MIDI today.A.personalB.electronic]C.multimedia]D.network
An（），serving a function similar to a physical wallet, holds credit card numbers, electronic cash, owner identification, and owner contact information and provides that information at an electronic commerce site's checkout counter.A.electronic walletB.electronic commerceC.third party paymentD.Internet banking
Which statement is FALSE concerning the interleave depth value？（）A、A higher interleave depth provides more protection from burst of noise on the HFC networkB、Higher interleave depth increase downstream latencyC、Lower interleave depth cause some packet loss on typical HFC networksD、None ofthe above
在系统预设的状态下，当在Finder窗口中双击其中一个文件夹图标时，将会（）。A、在原Finder窗口中打开并显示该文件夹内容B、创建一个新的Finder窗口并显示该文件夹内容C、在原Finder窗口中打开并显示“个人”目录内容D、创建一个新的Finder窗口并显示“个人”目录内容
单选题（）is the depth of the vessel at ship’s side from the upper deck to the lowest point of the keel.AExtreme draftBMolded draftCExtreme depthDMolded depth
单选题An electronic depth finder operates on the principle that（）.Aradio signals reflect from a solid surfaceBsound waves travel at a constant speed through waterCradar signals travel at a constant speed through waterDpressure increases with depth
单选题When anchoring,it is a common rule of thumb to use a length of chain（）.Afive to seven times the depth of waterBseven to ten times the depth of waterCtwice the depth of waterDtwice the depth of water plus the range of tide
单选题Which statement is true about loop guard？（）ALoop guard only operates on interfaces that are considered point-to-point by the spanning tree.BLoop guard only operates on root ports.CLoop guard only operates on designated ports.DLoop guard only operates on edge ports.
单选题In moderate wind and current what should be the length of chain with a single anchor?（）A5 times the depth of the water in good holding groundB10 times the depth of the water in shallow waterC2 times the depth of the water in poor holding groundD8 times the depth of the water in deep water
单选题The height of tide is the （）.Adepth of water at a specific time due to tidal effectBdifference between the depth of the water and the area's tidal datumCdifference between the depth of the water and the high water tidal levelDdifference between the depth of the water at high tide and the depth of the water at low tide
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When students learn apple, orange, the teacher gives students another word fruit.Which principle does the teacher follow in his/her vocabulary teaching?AWord-choice principle.BPresentation principle.CCulture principle.DSystematic principle.
单选题When students learn apple, orange, the teacher gives students another word fruit. Which principle does the teacher follow in his/her vocabulary teaching?AWord-choice principle,BPresentation principle.CCulture principle.DSystematic principle.
单选题In bad weather，what length of chain should be used with a single anchor? （）A3 times the depth of waterB6 times the depth of waterC10 times the depth of waterD15 times the depth of water
单选题The magnetic compass operates on the principle that（）.Alike magnetic poles attractBunlike magnetic poles repelCunlike poles attractDthe poles of the compass line up with the geographic poles of the earth
单选题Which of the listed types steam traps operates on the principle that hot water flashes to steam when its vapor pressure is rapidly reduced?（）ABall floatBThermostaticCBimetallicDImpulse
单选题All echo-sounders can measure the（）.Aactual depth of waterBactual depth of water below keelCaverage depth from waterline to hard bottomDaverage depth of water to soft bottom
单选题When anchoring a vessel under normal conditions，which scope of chain is recommended? （）AFour times the depth of waterBTwo and one-half times the depth of waterCFive to seven times the depth of waterDFifteen times the depth of water