题目内容

焊接过程中,常见的危害有:( )

A. 触电、焊接烟尘
B. 有毒气体、弧光辐射
C. 放射性物质、高频电磁场
D. 噪声

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铸造按生产方式的不同,主要有:( )

A. 砂型铸造
B. 特种铸造

Iam so sorry to learn that you have made no (improve)________on the design at all.

There has been a large(grow)________of light industries during there years.

He shook his head, but gave no(explain)________.

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