题目内容

含碳量愈高的钢，其焊接性能愈好。( )

A. 对
B. 错

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亚共析钢的奥氏体化温度一般在ACcm以上，才能获得单相奥氏体组织。( )

A. 对
B. 错

阐述供应商绩效评估指标体系的构成情况。

Directions: Study the following graph carefully and write an essay. Your essay should meet the requirements below: (1)describe the graph and interpret its meaning, (2)point out the problems and give your comments. You should write 160--200 words neatly.

CO2气体保护焊焊接回路中串联电感的目的是防止气孔的产生。( )

A. 对
B. 错