A tank which carries liquid is dangerous to the stability of a vessel when it is（）.

A semisubmersible which will not remain upright and will assume a list either to port or starboard is likely to have（）.

A.a large TCG
B.a negative GM
C.excessive ballast
D.insufficient deck load

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A disk with a horizontal line through its center，equivalent to the summer load line，is called the（）.

A.deadrise mark
B.maximum allowable draft mark
C.plimsoll mark
D.tonnage mark

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