. I hear __________ boys in your school like playing football in their spare time, though others prefer basketball.

A．quite a lot

B．quite a few

C．quite a bit

D．quite a little

将联轴器左端螺钉松开，调开间隙（）mm，且与电机支座距离为6mm，套装到电机输出轴上，并紧固。