采用压边装置的目的是防止()。
参考答案:坯料在拉延过程中法兰边起皱
主电路中转子回路的作用是什么?
Excuse me, could you tell me _______?
A.where the zoo is
B.how can I get to the zoo
C.which bus can I take to the zoo
D.if is there a zoo