题目内容

What is the wavelength, if the frequency is 6MHz？

A. 180m
B. 18m
C. 50m
D. 500m

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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

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

下列选项是分拣工作特点的是()。

A. 工作标准高
B. 技术要求高
C. 质量要求高
D. 手续要求高