常用的电弧焊焊接方法有()。
A.埋弧焊
B.焊条电弧焊
C.钨极气体保护焊
D.电阻焊
E.熔化极气体保护焊
参考答案:A, B, C, E
The journey around the world took the old sailor nine months, _____ the sailing time was 226 days.
A.of which
B.during which
C.from which
D.for which
卡比多巴:
A.产生作用慢,持久,缓解肌僵直效果好B.单独使用无抗震颤麻痹作用C.产生作用快,持续时间短D.中枢抗胆碱作用明显,缓解震颤好E.有增加多巴脱羧酶活性作用