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电焊机机壳必须良好接地是为了()。A、防止设备漏电引起人身触电B、防止设备过热烧损C、节约用电D、使焊机电流稳定...
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CG1—30型半自动气割机在气割结束时,应先关闭()。...
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钢轨闪光焊时,增加钢轨加热温度并使温度梯度分布较缓,可以防止()...
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