罗森塔尔和皮内泊格认为，危机的特点是具有风险性和（）
A.规律性
B.一般性
C.危害性
D.长期性
参考答案：C
Could you tell me _______?
A．whose the pen on the desk belongs to
B．why spend so much time on games
C．whether he’ll come back next week
D．what should I do with the problem
混凝土构件在哪些因素影响下会产生变形？变形类型有哪几种？
