English is hard to learn, ________ I like it. [ ]
A. and
B. so
C. but
D .or
答案:C
刚性防水层面分仓缝的宽度在( )m左右。
A.20
B.25
C.30
D.35
()是对系统是否按照预定要求进行检查和评价活动。
A、评价
B、规划
C、审核
D、评审