单项选择题
Stable equilibrium for a vessel means that the metacenter is（）.
A.at a lower level than the baseline
B.on the longitudinal centerline
C.higher than the center of gravity
D.at amidships
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Ship’s officers should check every cargo compartment after it is filled with bulk grain to ensure（）.
A.all lighting circuits are energized
B.all void spaces are filled
C.the correct grade of cargo has been loaded
D.the heavier grade is in the lower hold -
单项选择题
Reinforcing frames attached to a bulkhead on a vessel are called（）.
A.side longitudinals
B.intercostals
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Progressive flooding on a ship is controlled by securing watertight boundaries and（）.
A.transferring drill water
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