一般情况下当坍落度小于（）时，用标准振动台成型，否则，用人工插捣法成型。
A．50
B．60
C．70
D．80
参考答案：C
- May I go to the movies with you?
- I’m afraid not you have a ticket, because I have only one.
A． if B. unless C. though
止浆岩幅
