“You are not a new member , are you?”  “___. I joined only yesterday.”

A．No, I am not

B．Yes, I’m not

C．No, I’m

D．Yes, I am

内燃机飞溅润滑的特点之一是（）。

A、工作可靠

B、结构简单

C、润滑效果好

D、有净化作用