板块地面铺设水泥砂浆结合层时,对水泥有什么要求?
参考答案:
宜采用硅酸盐水泥、普通硅酸盐水泥、矿渣硅酸盐水泥。强度等级不应小于32.5。
He couldn't buy the dictionary because he had ________money with him.
A.a few
B.few
C.a little
D.little
CRH380BL型动车组如何启动紧急驱动模式?