手工电弧焊常用的设备有哪三类？
参考答案：
①交流电焊机；
②旋转式直流电焊机；
③硅整流电焊机。
Most businessmen are more interested in the ________ success of their products than their educational
values.[ ]
A．commercial
B．cultural
C．classical
D．criminal
治外有风寒表证内兼湿阻中焦证宜选（）
A.藿香
B.白豆蔻
C.五加皮
D.砂仁
E.茯苓
