焊接铸铁、高碳钢、硬质合金应采用()火焰。
A.中性焰
B.氧化焰
C.碳化焰
参考答案:C
To be honest, the role John plays in this film doesn't come up to my __________, though he is one
of my favorite actors . [ ]
A. excuses
B. explanations
C. experiences
D. expectations
同时是2和3的倍数的数中,最小的是( ),两位数中最大的是( )。