红外线对人体的危害主要是引起组织的热作用，焊接时（）方法的产

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问题单项选择题

红外线对人体的危害主要是引起组织的热作用，焊接时（）方法的产生的红外线的强度最大。

A.焊条电弧焊

B.氩弧焊

C.CO₂气体保护焊

D.等离子弧焊

答案

参考答案：D

选择题

It takes ________ half an hour ________ on foot.

A．my, to get to school

B．me, going to school

C．my, going to school

D．me, to get to school

选择题

The little girl_______ in the big house alone at night.[ ]

A. dares not live

B. dare not live

C. doesn't dare living

D. dares not to live