单项选择题
A tank which carries liquid is dangerous to the stability of a vessel when it is（）.
A.low in the vessel
B.completely empty
C.completely full
D.slack
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A.a large TCG
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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（）.
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B.draws less water with an increase in speed
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