( ) The monetary unit in England is dollar.
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( ) Red Bookstore not only refers to its red decoration, but the “red” revolution spirit it represents.
A. 对
B. 错
对称循环应力比R为( )
A. 0
B. 1
C. ∞
D. -1
材料是否疲劳的判断依据指标是( )
A. 抗拉强度
B. 断裂强度
C. 疲劳强度
D. 屈服强度
疲劳裂纹扩展区的宏观特征是( )
A. 疲劳条带
B. 纤维区
C. 贝纹线
D. 放射区