粗车偏心圓时，外圆车刀可取（）刃倾角。
A．正
B．负
C．0゜
参考答案：B
The teacher ___ the students not to ___ quickly when answering questions.
A．told, say
B．said, talk
C．asked, speak
D．spoke to, tell
为什么采用双拍磁放大器？
