水泥稳定土类材料自拌合至摊铺完成,不得超过()。分层摊铺时,应在下层养护()后,方可摊铺上层材料。
A.2h;5d
B.2h;7d
C.3h;5d
D.3h;7d
参考答案:D
_____ was not until yesterday that he realized that he was wrong. [ ]
A. That
B. He
C. It
D. This
预塔加萃取水的作用是:()
A、稳定产品的水溶性;
B、提高产品的稳定性。
C、既稳定产品的水溶性又提高产品的稳定性。