外包聚氯乙烯工业膜压边()。
A.无要求
B.可大可小
C.有规定
D.可松可紧
参考答案:C
There is something wrong with my computer. I don't know how to_____ it. [ ]
A. do with
B. catch up with
C. deal with
D. help with
进化理论认为择偶是先天的,()则认为是后天觉得而得的。