GMDSS-equipped ships will be required to perform which of the following communications functions？
A. Distress alerting and maritime safety information
B. Search and Rescue coordination and on-scene communications
C. Bridge-to-bridge and general radio communications
D. All of these
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What is the term which refers to the supply of electrical energy required to supply radio
A. Emergency power
B. Reserve source of energy
C. Ship’s emergency diesel generator
D. Ship’s standby generator
Which equation shows right ratio between the frequency (f) and the wavelength (Lambda) of radio waves？
A. f=Lambda/C
B. f=C x Lambda
C. f=C/Lambda
D. f=C x 6.28 x Lambda
What is the approximate range of MF radio waves during the day time？
A. 30 nautical miles
B. 600 nautical miles
C. 150 nautical miles
D. 1200 nautical miles
在下列工况下安装的阀门，从每批阀门中抽查10%，且不少于一个的应该是()。
A. 输送有毒流体、可燃流体管道的阀门
B. 输送设计压力大于1MPa流体管道的阀门
C. 输送设计压力小于等于1MPa且设计温度低于—29℃或高于186℃非可燃流体、无毒流体管道的阀门
D. 输送设计压力小于等于1MPa且设计温度为—29℃或——186℃非可燃流体、无毒流体管道的阀门
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