题目内容:
井巷工程质量抽检时,合格率应达到( )以上。
A.60%
A.60%
A.60%
B.70%
B.70%
B.70%
C.80%
C.80%
C.80%
D.90%
D.90%
D.90%
参考答案:
答案解析:
井巷工程质量抽检时,合格率应达到( )以上。
A.60%
A.60%
A.60%
B.70%
B.70%
B.70%
C.80%
C.80%
C.80%
D.90%
D.90%
D.90%