问题
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
答案
参考答案：D
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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
参考答案：D