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【单选题】
围绕受力构件内某点处取出的微棱柱体平面应力状态如图所示，已知该点两个方向面上的切应力，正应力为零。则该点的三个主应力大小为多少？【图片】A.
2.414 τ ， 0 ， -0.414 τ
B.
0.414 τ ， 0 ， - 2 .414 τ
C.
0 ， -0.414 τ ，- 2.414 τ
D.
2.414 τ ， 0.414 τ， 0
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【单选题】His new car broke down yesterday, it needs _____. [ ]
A.
repaired
B.
being repaired
C.
to repair
D.
repairing
【单选题】The car______halfway for no reason.
A.
broke off
B.
broke out
C.
broke up
D.
broke down
【单选题】在我国社会义初级阶段的主要矛盾中，矛盾的主要方面将长期是( )
A.
人民日益增长的物质文化需要
B.
生产力落后
C.
经济文化发展的不平衡
D.
社会需要的动态性和全面性
【单选题】His car ___ on his way home yesterday. A. broke B. was broke C. was down D. breaking
A.
broke
B.
was broke
C.
was down
D.
breaking
【单选题】His race-car _____ halfway. He had to give up the race. [ ]
A.
broke down
B.
broke in
C.
broke up
【单选题】A stranger ___ his room without his permission.
A.
broke up
B.
broke out
C.
broke into
D.
broke down
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