室内给水管道应设置阀门，当管径大于50mm时宜采用（）。

A．球阀

B．蝶阀

C．截止阀

D．旋塞阀

The （） describes, in detail, the project's deliverables and the work required to create those deliverables.

A.project scope statement

B.project requirement

C.project charter

D.product specification