You may improve a vessels stability by （）.<br>A:keeping the fuel tanks topped off<br>B:increasing the free surface effect<br>C:keeping the fuel tanks at least half MI<br>D:keeping at least one fuel tank empty for slops

You may improve a vessels stability by （）.
A:keeping the fuel tanks topped off
B:increasing the free surface effect
C:keeping the fuel tanks at least half MI
D:keeping at least one fuel tank empty for slops

出自：海船船员证

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