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问题 单项选择题

长输管线均采用（），连接方法为焊接低压庭院管可采用（），压力不能超过400Pa。

A.钢管；PE

B.铸铁管；普通塑料管

C.镀锌铁管；PE

D.黑度管；普通塑料管

答案

参考答案：A

单项选择题

Which one of the following is NOT a trade-off decision that must be made in the development of the project plan

A) Whether to use skilled or unskilled laborers.
B) The amount of profit vendors should make versus the profit other vendors have received in the past.
C) Manufacturing in-house or sub-contracting out the work.
D) The important of cost versus quality.
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