喷混凝土对回弹量有何要求?
参考答案:喷拱部时,混凝土的回弹率不应大于25%,喷边墙时,混凝土的回弹率不应大于15%,湿喷时的粉尘含量不得大于2mg/m2。
Do you know Hawking does not like about his speech computer?
A.that it is what
B.what it is that
C.it is that what
D.what is it that
液体商品,盘点时应采取()法。
A、标尺测量法
B、压码加零法
C、盘整加零法
D、以销计存法