高云主要由什么构成().
A.臭氧
B.过冷水滴
C.冰晶
参考答案:C
—Can you imagine that we've translated 30% of the long article today?
—_______. You're so smart and quick! [ ]
A. It's a pleasure
B. I don't mind
C. That's it
D. I can't believe it
高层建筑为了减小地基的变形,可采取的有效形式是( )。
A.钢筋混凝土十字交叉基础 B.箱形基础C.筏形基础 D.扩展基础