题目内容

The whole composition is good _____ some careless mistakes.

A. except for
B. except that
C. except
D. except from

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Airline personnel can buy _____ tickets at reduced prices.

A. bus
B. train
C. flight
D. movie

Six _____ languages are used at the United Nations.

A. national
B. official
C. native
D. authority

「かな」用于句尾，表示说话人疑问、怀疑或者不知如何是好的心情。

A. 对
B. 错

求图中力系的合力FR及其作用位置（）？

A. FR = 3 kN，作用于x = 4/3 m 处向下
B. FR = 3 kN，过o点向上
C. FR = 3 kN，作用于x = 4/3 m 处向上
D. FR = 3 kN，过o点向下