堆石坝混凝土防渗面板宜选用（）。

A.普通水泥

B.粉煤灰水泥

C.矿渣水泥

D.砌筑水泥

Having the client assist in the project planning ______ .

A．is not always recommended since the client does not have adequate knowledge of project management

B．enables better planning since they are familiar with project insights

C．provides only some understanding, but usually the client dealing with the project has only limited authority

D．usually confuses the situation