It is reasonable for people to pursue a career in fields related ____ their favorite hobbies（）
A. for
B. on
C. to
D. with
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％
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