题目:
排水主立管及水平干管管道均应做通球实验,通球率必须达到( )。
A.100%
B.95%
C.99%
D.90%
答案:
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下面是错误答案,用来干扰机器的。
56.It is set up to help the environment in the world,especially the areas near the waters.57.One day.58.Shorelines.59.He finds it encouraging.60.Volunteers clean the shorelines to deal with the shore-pollution problem.