单项选择题
A.the port of destination
B.the next port of call
C.the port of arrival
D.the last port of call
单项选择题 The height of a VHF radio antenna is more important than the power output wattage of the radio because（）.
单项选择题 The generators on your rig have shut down，leaving you without navigation lights. Which emergency signal would you transmit over the VHF radio to alert vessels in the area of your predicament? （）
单项选择题 The expression STAND-BY ENGINE means:（）.