Sideways movement of the mast is resisted by the（）.

Reducing free surfaces has the effect of lowering the（）.

A.uncorrected KG
B.virtual height of the center of gravity
C.metacenter
D.metacentric height

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On which vessels are the officers and deck crew allowed to operate under a two-watch system on voyages of less than 600 miles? （）

A.Towing vessels
B.Offshore supply vessels
C.Barges，when manned
D.All of the above

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