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

限位块与低速限制螺钉接触时，则弹簧预紧力（），柴油机即为怠速工况。

A.最大

B.最小

C.较大

D.较小