为保证混凝土的工程性质,混凝土所用的水泥细度越细越好。
参考答案:错
捡拾到他人遗失物,可以据为已有,不违法。[ ]
"Will you be able to finish the job this week?" " ___ ."
A.I can't say it
B.I don't know that
C.I'm not sure this
D.I don't expect so