—Can you hear me?

—Sorry, I can't. Would you please speak ______? [ ]

A. clearly enough

B. clear enough

C. enough clear

D. enough clearly

CQ40型、CQ40A型、CQ40B型机械式钢筋切断机中40的含义是（）

A.切断钢筋的最大直径是40mm

B.切断钢筋的最小直径是40mm

C.切断机的转速是40r/min

D.切断机的功率是40Kw