Keeping the draft at or below the load line mark will insure that the vessel has adequate（）.<br>A:ballast<br>B:reserve buoyancy<br>C:displacement<br>D:rolling periods

Keeping the draft at or below the load line mark will insure that the vessel has adequate（）.
A:ballast
B:reserve buoyancy
C:displacement
D:rolling periods

出自：海船船员证

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