进行泵送混凝土配合比设计时，泵送混凝土的坍落度不低于( )。
A．80mm
B．90mm
C．100mm
D．120mm
参考答案：D
— Can you tell us what is important to a businessman?
— _______ information.
[ ]
A. Collect
B. Collected
C. Having collected
D. Collecting
