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单选题 Which frequency is designated for VHF Digital Selective Calling
学科：默认课程
时间：2025-10-26 23:54:46
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题目1单选题
4, What signal is used to allow a scanning receiver to stop and detect an MF or HF DSC distress messageA. A two-tone alarm code is receivedB. A series of four-second dashes are receivedC. A 200-bit 100-baud dot pattern is receivedD. , A steady audio alarm is received, allowing the operator to select the desired frequencyfor the reception of the message
题目2单选题
Which material should be consulted when you want to find the working frequencies ofShanghai RadioA. ALRS (Admiralty List of Radio Signals)Volume 1,Part 1B. ALRS (Admiralty List of Radio Signals)Volume l, Part 2C. ALRS(Admiralty List of Radio Signals)Volume 3,Part 1D. ALRS (Admiralty List of Radio Signals)Volume 3, Part 2
题目3单选题
Which of the following keystrokes or characters is sent as part of ARQ communicationsto signal the end of the text of a chargeable messageA. Four "N"s,i.e."NNNN"B. "BRK+"C. Four "K"s, i. e."KKKK"D. , Five periods(".....")
题目4单选题
ITU channels areA. frequency assignments specific to Chinese vessels onlyB. international designation of specific frequenciesC. VHF frequenciesD. ,International Traffie Utility frequencies
题目5单选题
126, The ARQ mode should be appliedA. when two stations communicate with each otherB. , in any radio system at any timeC. when one ship sends messages to anotherD. ,for communication among some stations
题目6单选题
127, What action should be taken once you've sent a false distress alert on MF-DSCA. , Make a voice announcement to cancel the alert on 2,187. 5 kHzB. , Make a voice announcement to cancel the alert on 2,174.5 kHzC. Make a voice announcement to cancel the alert on 2,182.0 kHzD. , Send another DSC alert and follow on with voice on 2,182.0 kHz
题目7单选题
Which of followings should be consulted for the MMSI of Shanghai RadioA. ALRS(Admiralty List of Radio Signals)Volume l,Part 1B. ALRS (Admiralty List of Radio Signals)Volume l,Part 2C. ALRS (Admiralty List of Radio Signals)Volume 3,Part 1D. ALRS (Admiralty List of Radio Signals)Volume 3,Part 2
题目8单选题
39, What determines the spares and maintenance materials requirements for the NBDP equipment under GMDSSA. ITU PublicationsB. , The manufacturer's instruction manualsC. list of international radio beacon call signsD. ,The GMDSS Maintainer's requirements
题目9单选题
Which frequency is designated for VHF Digital Selective CallingA. 156.300 MHzB. 156.525 MHzC. 156.650 MHzD. 156.800 MHz
题目10单选题
In abbreviation FEC, the letter E meansA. effectB. eastC. eraseD. error
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