单项选择题

对于“粪土之墙”的翻译，哪一项最为恰当：
A、A. A wall of dirt
B、B. A wall of dried dung
C、C. A wall of dust
D、D. A wall of rubbish

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单项选择题

图a、b、c中，S为总质心，图　　和　　中的转子具有静不平衡，图　　　　　中的转子是动不平衡。

单项选择题

The figure shows a gate made of a uniform plate of height 4 m and width 1 m, hinged about it a horizontal axis through its center of gravity, G. Depth of water on the upstream side of the plate, h is 3 m. The magnitude of the minimum force (kN) that must be applied at A to keep the gate in the vertical position is most nearly （）。 A. 22 B. 26 C. 41 D. 66