弯制双曲唇弓的双曲部位，主要使用（）
A.平头钳
B.梯形钳
C.日月钳
D.卡环钳
E.小梯形半月钳
参考答案：C
The World Table Tennis Championship began the morning of May 25, 2010 Moscow, Russia.
A．Fifty; in; in
B．Fiftieth; on; in
C．Fiftieth; in; on
D．Fifty; on; in
离心泵启动前应用手转动连轴器是否灵活或有异常声音。
