单项选择题
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 -
单项选择题
A deep draft VLCC (100，000 DWT+) navigating in a narrow channel or canal（）.
A.draws more water than when underway in deep water
B.draws less water with an increase in speed
C.requires less power for a given speed
D.steers better under full power -
单项选择题
A current moving across a lock entrance toward the river or toward the dam is called a(n)（）.
A.cutoff
B.outdraft
C.lockwash
D.springpool
