命题“平行四边形的对角线互相平分”的逆命题是 （ ）
对角线互相平分的四边形是平行四边形
—May I have a word with you?
—________.I’m not busy, anyway.
A．By no means
B．By all means
C．By means of
D．By any means
钻柱组成及其作用
