单项选择题
SOLAS vessels should be able to communicate with a shore station（）.
A.no matter where they are and what time it is B.at scheduled time and in major ocean regions C.at fixed time and position D.when they get permission
单项选择题 General radio communications in the global system may（）ship’s safety.
单项选择题 The distress alert should（）the ship in distress.
单项选择题 Vessel in distress（）indicate their position by any method.
