Though he said he was a doctor, ________, he knows nothing about medicine.

A．as a matter of fact

B．as well

C．as a result

D．as if

下列整体式水磨石楼地面面层的做法中，哪一条正确()

A．水泥与石粒之比一般为1：1．5～1．2

B．石子粒径一般为4～12mm

C．水磨石面层厚度一般为10～15mm

D．美术水磨石水泥中掺入矿物的量不宜大于水泥重量的3％～6％