A hydrostatic release mechanism for a liferaft（）.<br>A:must be wet before it will release<br>B:should be kept in a watertight cover except in an emergency<br>C:will inflate the raft in its cradle if operated manually<br>D:must be submerged to a certain depth to release automatically

A hydrostatic release mechanism for a liferaft（）.
A:must be wet before it will release
B:should be kept in a watertight cover except in an emergency
C:will inflate the raft in its cradle if operated manually
D:must be submerged to a certain depth to release automatically

出自：海船船员证

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