题目内容
直流焊接时，焊条接电源负极的接法叫正接。( )
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Questions 15 to 17 are based on a talk on student housing. You now have 15 seconds to read Questions 15 to 17. What do the married student apartments not allow
焊接过程中，当电弧长度改变时，主要是弧柱长度发生变化。( )
采用碳棒在焊件上试焊，如果试焊时碳弧燃烧稳定，电弧被拉起很长也不断弧，而且在断弧后，碳棒端面光滑，此种接法为直流反接。( )
pollution can be controlled by increasing the production cost of polluting goods
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