... fire alarm system 火警系统 negative pulse 负极性脉冲 overhanging structure 悬挑构件 ...
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交流脉冲MIG焊其焊缝熔深及焊丝熔化速度不仅与焊接电流有关，而且与负极性比率有关。
Weld penetration and wire melting speed of AC PMIG welding not only have relationship with welding current but also with electrode negative ratio.
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