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backweld

n. 背焊缝

1、封底焊缝

... backweathering后退风化 backweld封底焊缝 backwelding反面焊接 ...

2、背焊缝

... backwearing n. 使陡崖[山坡]后退而不改变它的倾斜度的侵蚀 backweld n. 背焊缝 back-work n. 工作面和井筒之间的工作, 井下工作面以外的工作, 辅助工作 ...

backweld d封底焊缝

能源科学技术

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