当催化剂活性增加时，树脂的粒径（）。
A.增大
B.减小
C.无影响
D.不变
参考答案：A
Let us suppose that you are in________position of________parent.Would you allow your
child to do such a thing?[ ]
A. /; a
B. a; /
C. the; a
D. the; /
桥梁静载试验的挠度观测点一般布置在桥中轴线位置。( )
