Reserve buoyancy is（）.<br>A:also called GM<br>B:the void portion of the ship below the waterline which is enclosed and watertight<br>C:affected by the number of transverse watertight bulkheads<br>D:the watertight portion of a vessel above the waterline

Reserve buoyancy is（）.
A:also called GM
B:the void portion of the ship below the waterline which is enclosed and watertight
C:affected by the number of transverse watertight bulkheads
D:the watertight portion of a vessel above the waterline

出自：海船船员证

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