The signals that will be used for emergency should be clearly （）.A、set outB、set offC、get offD、cut off
The signals that will be used for emergency should be clearly （）.
- A、set out
- B、set off
- C、get off
- D、cut off
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What is the difference between 1+1 and 1：1 protection switching？（）A、 1+1 is based on APS， while 1：1 is based on IPS.B、 1：1 is used in SNCP switching， while 1+1 is used in MS-SPRing switching.C、 1+1 sends signals on Working and Protect paths， while 1：1 sends signals only on Working path.D、 1+1 sends signals on Working path ONLY， while 1：1 sends signals on both Working and Protect paths.
What is the difference between a CSU/DSU and a modem?（）A、A CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.B、A CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.C、A CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.D、A CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
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单选题Which statement is TRUE concerning the danger signal?（）.AWhen any vessel fails to understand the intentions of an approaching vessel she must sound the danger signalBOnly the stand-on vessel can sound the danger signalCDistress signals may be used in place of the danger signalDThe danger signal consists of 4 or more short blasts of the whistle
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单选题Important changes to charts and lights（including temporary ones），radio signals and sailing directions are listed in（）.AWeekly Admiralty Notices to MarinersBThe Mariners HandbookCOcean Passages for the WorldDSymbols and Abbreviations used on Admiralty Charts，Chart 5011
单选题How should signal flares be used after you have abandoned ship and are adrift in a liferaft?（）.AImmediately use all the signals at onceBUse all the signals during the first nightCEmploy a signal every hour after abandoning ship until they are goneDUse them only when you are aware of a ship or plane in the area
单选题What is the difference between a CSU/DSU and a modem?（）AA CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased lineBA CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased lineCA CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone lineDA CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line
单选题When whistle signals are used for launching lifeboats，one short blast means（）.Ause the float-free method onlyBlower all boatsCraise all boatsDdrill is over，secure all boats
单选题Which of the following statements is TRUE regarding automatic identification systems (AIS) ? （）AAIS may be used to make passing arrangements via ship-to-ship text messaging thus relieving a vessel operator from sounding whistle signals or making contact via radiotelephoneBAIS may be used to make passing arrangements via ship-to-ship text messaging but a vessel operator is still required to sound whistle signals unless the arrangement is made via radiotelephoneCAIS cannot be used to make passing arrangements because the system does not have the ability to communicate from ship-to-ship in this mannerDAIS cannot be used to make passing arrangements because the use of the ship-to-ship text messaging feature in this way is prohibited
单选题What is the difference between 1+1 and 1：1 protection switching？（）A 1+1 is based on APS， while 1：1 is based on IPS.B 1：1 is used in SNCP switching， while 1+1 is used in MS-SPRing switching.C 1+1 sends signals on Working and Protect paths， while 1：1 sends signals only on Working path.D 1+1 sends signals on Working path ONLY， while 1：1 sends signals on both Working and Protect paths.
单选题The signals that will be used for emergency should be clearly （）（列出）.Aput outBset outCset onDput on
单选题What is the difference between a CSU/DSU and a modem？（）AA CSU/DSU converts analog signals from a router to a leased line; a modem converts analog signals from a router to a leased line.BA CSU/DSU converts analog signals from a router to a phone line; a modem converts digital signals from a router to a leased line.CA CSU/DSU converts digital signals from a router to a phone line; a modem converts analog signals from a router to a phone line.DA CSU/DSU converts digital signals from a router to a leased line; a modem converts digital signals from a router to a phone line.
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