题目内容

A ship operating in sea area A1 must have the following provisions of maintenance:

A. Shore maintenance
B. Duplication of equipment
C. At Sea Maintenance
D. Any one of these

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Which of the following systems is most likely to be subject to fading or static interference？

A. HF NBDP
B. INMARSAT
C. Digital Selective Calling on channel 70
D. VHF ARQ

What is the approximate range of VHF radio waves during the day time？

A. 30 nautical miles
B. 600 nautical miles
C. 150 nautical miles
D. 1200 nautical miles

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A. 工作标准高
B. 技术要求高
C. 质量要求高
D. 手续要求高

Under GMDSS, the proper functioning of the DSC facilities shall be tested periodically without radiation of signals, by use of the means provided by equipment. What is the period？

A. Weekly
B. Annually, by a representative of the MSA
C. Daily
D. Monthly