单项选择题
---Thank you so much for the lovely evening. Jim, Frank and I hadsuch a good time.---You're welcome,John.
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B.
B.
C.
C.
D.
D.
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I suppose documentary films are the least amusing.-().
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--Would you mind if I open the window for awhile?-----()
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单项选择题
实验表明,由同一材料制成的试样,在相同变形形式的交变应力作用下,当循环特征r =( )时,其持久极限最低。
A.5
C-1
D0.5
