混凝土中产生拉应力，钢筋中无应力……………………………………()
查看答案
γ为混凝土受压时的弹性系数，当应力增大时________。
A. γ减小
B. γ≈1
C. γ=O
徐变与荷载持续时间t成线性关系……………………………………()
A. 正确
B. 错误
What was the woman doing on Friday？
A. Preparing for the calculus exam.
B. Viewing an art exhibit.
C. Participating in a special class activity.
D. Packing for her vacation.
混凝土强度等级由轴心抗压强度确定。()
A. 正确
B. 错误
微信支付 
支付宝支付