抹灰由底层、中层和面层组成,其中底层的作用是( )。
A.黏结及初步找平B.黏结C.找平D.装饰
参考答案:A
[ hero book one luck good ]
小题1:I go to the park a week.
小题2:You are a dog.
小题3:I like them very much. They are all my .
小题4: Kitty can dance .
小题5: I have a few in my bag.
装卸、搬运50公斤以上处理剂,可以一个人进行作业。