It is reasonable for people to pursue a career in fields related ____ their favorite hobbies()
A. for
B. on
C. to
D. with
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It was because of his good performance at the interview ____ he got the job with the big company()
A. so
B. while
C. what
D. that
粗丝C02焊中,熔滴过渡往往是以()的形式出现
A、喷射过渡
B、射流过渡
C、短路过渡
D、粗滴过渡
C02焊用的C02气体纯度,一般要求不低于()
A、95%
B、99%
C、99.5%
D、99.9%
目前焊丝外层镀铜主要目的是()
A. 增加焊丝导电性
B. 防止焊丝氧化
C. 增加合金含量
D. 增加合金含量