单项选择题
The SART should have sufficient battery capacity to operate in the stand-by condition for（）hours and should continuously work for（）hours.
A.120/20 B.56/18 C.100/16 D.96/8
单项选择题 It is required that ships proceeding at sea should keep continuous watch on（）.
单项选择题 The transmission of a（）indicates that a ship is in distress and requires immediate assistance.
单项选择题 A ship station on receiving a shore-to-ship distress alert should（）.
