配水管网设置一对置水塔，最高用水时其水压控制点应拟定在（）。

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问题单项选择题

A.管网供水分界线上

B.水塔水柜最高水位上

C.用水区的火灾发生点

D.用水区大用户所在点上

答案

参考答案：C

选择题

—Mary was being badly treated when John happened to pass by and helped her out.

—I think it was not a pure ________ but had been well planned. [ ]

A. coincidence

B. occurrence

C. arrangement

D. incident

单项选择题

普通钢含杂质元素较多，其中规定（），S、P分别表示磷、硫含量。

A、S≤0.030％、P≤0.035％

B、S≤0.045％、P≤0.055%

C、S≤0.040％、P≤0.040％

D、S≤0.035％、P≤0.035％