题目内容

精炼炉降温冶炼过程温度控制的原则:停电,吹氩()

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史志中的地理志有郡国志、郡四志、地性志、职方考等不同名称,但性质相同()

_____ at in this way, the situation doesn ’t seem so desperate.

A. Looking
B. Looked
C. Being looked
D. To look

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()

He bought a house for his children ________

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

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