题目内容

斜二等轴测投影的轴间角∠XOZ为

A. 120°
B. 90°
C. 45°
D. 135°

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正等轴测投影的轴间角均为

A. 90°
B. 120°
C. 45°
D. 60°

下面斜二等轴测图正确的轴间角是( )。

A. ∠XOZ=30°
B. ∠XOY=135°
C. ∠XOZ=90°
D. ∠YOZ=120°

The violin will have to be tuned before it _____.

A. is played
B. should play
C. plays
D. is being played

By the time you arrive in London, we _____ in Europe for two weeks.

A. had stayed
B. shall stay
C. will have stayed
D. have been staying