熔化极氩弧焊最适合于焊接中等厚度以上的铝及铝合金焊件。()
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The switchboards are those in which all the live parts are installed behind the panels and
A. open
B. open front type
C. live front type
D. dead front type
粗丝CO2气体保护焊最好选用具有平硬外特性的电源。()
CO2气体保护焊电源采用直流正接时,产生的飞溅要比直流反接时严重得多。()