A flag is _____ a piece of cloth. It stands for a nation’s people, their land and their history.

A．not more than

B．not less than

C．more than　

D．no more than

物体静止在斜面上，若斜面倾角增大（物体仍静止），物体受到的斜面的支持力和摩擦力的变化情况是

A．支持力增大，摩擦力增大

B．支持力增大，摩擦力减小

C．支持力减小，摩擦力增大

D．支持力减小，摩擦力减小