题目内容

真空脱气的基本原理:钢中气体的溶解度与金属液上该气体分压的平方根成反比,只要提高该气体的分压力,则溶解在钢液中气体的含量随着降低()

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依据确定主题的原则,谈谈如何确定班会主题?

The minister of finance is believed _____ of imposing new taxes to raise extra revenue.

A. that is thinking
B. to be thinking
C. that he is to think
D. to think

向钢液深处吹入Si粉等粉剂进行非金属夹杂物变性处理是属于喷射冶金范畴()

钢中H主要来自于原材料、耐火材料及炉气的水分()

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