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【单选题】
在高分子材料的拉伸试验中,提高拉伸速率时,则( )。A.
σ B 升高、ε B 降低
B.
σ B 降低、ε B 升高
C.
σ B 升高、ε B 升高
D.
σ B 降低、ε B 降低
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A.
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B.
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C.
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D.
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A.
At 5:15．
B.
At 5 o'clock．
C.
At 5:45．
D.
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【简答题】Nous allons au cinéma soir.
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