着痹的特点是
A．关节游走窜痛
B．关节疼痛剧烈
C．关节痛而沉重不移
D．关节红肿热痛
E．关节痛，小腿部兼见结节红斑
参考答案：C
—How did you find the talk this morning?
— ________.
A．By asking my students
B．It was easy to find
C．Very disappointing
D．Just in time for it
在焊接过程中，接直流弧焊电源正极的电极称为阳极，接负极的电极称为（）。
