低碳钢是亚共析钢,在缓慢冷却条件下,低碳钢正常组织是铁素体F+珠光体P。
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压力容器设备主螺栓均属于主要受压元件。
A. 对
B. 错
压力容器上焊接的临时吊耳和拉筋垫板等的材质及焊接时所用焊条只要与容器壳体材质一致,割掉后打磨即可。
A. 对
B. 错
Tom'spart-timejobexperiencewasvery(value)__________tohisjobhuntingwhenhegraduated.
They had (installation) ____________ a new phone line in their apartmen