Ceq（%）＝C+1/6Mn+（Cr+V+Mo）/5+（Cu+Ni）/15是（）的计算公式。
参考答案：碳当量
—Do you think the girl is _____thin?
—No, I don't think so.
A. a few
B. a kind of
C. a little bit
D. a bit of
焊条钢的产品标准是（）。
A.GB3429
B.GB2467
C.GB701
D.GB702
