题目内容

P元素是有害元素，但是它能提高钢的抗腐蚀性以入改善钢的切削性能（）

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He bought a house for his children ________

A. lived in
B. to live in
C. lived
D. to live

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（）

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