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【单选题】
两根长度相等、直径不等的圆轴受扭后,轴表面上母线转过相同的角度。 设直径大的轴和直径小的轴的横截面上的最大切应力分别为 和 , 切变模量分别为 G 1 和 G 2 。试判断下列结论的正确性。A.
＞ ；
B.
＜ ；
C.
若 G 1 ＞ G 2 ，则有 ＞ ；
D.
若 G 1 ＞ G 2 ，则有 ＜ 。
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【单选题】The mother was afraid to let the boy ______ the tree.
A.
to risk climbing
B.
risk climbing
C.
to risk to climb
D.
risk to climb
【单选题】What can we learn about the dialogue?
A.
The mother was not a good cook.
B.
The boy doesn't like MacDonald.
C.
They sometimes go out for dinner.
【单选题】The mother was nervous because she had not her son who was away at a boarding school.
A.
heard from
B.
heard of
C.
heard about
D.
heard out
【单选题】In the car accident the mother was killed, but her two-year-old son was found_____.
A.
alive
B.
lively
C.
living
D.
live
【简答题】The mother was so sad that she didn't want to say anything.(否定句) The mother was _____ sad _____ say anything.
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