使用酸性焊条时，熔滴过渡形式为（）。
A.细颗粒过渡
B.大颗粒过渡
C.短路过渡
D.喷射过渡
参考答案：A
Mr Zhang isn't here. He's flown to Tibet, ______? [ ]
A. ha she
B. hasn't he
C. is he
D. isn't he
《灵枢·九针十二原》对五输穴的记载中，复溜为（）
A.井
B.荥
C.输
D.经
E.合
