发布时间:2025-01-18 09:49:05
Q345C即普通低合金钢16Mn.常用电焊条牌号一般为J502(型号E5003),重要构件采用碱性焊条J507(型号E5015)。
好心人们西安的红旗长就是西安航空发动机集团有限公司的待遇如何啊
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