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【单选题】
下列说法正确的( )。A.
所谓的短弧是指弧长为焊条直径2~4倍
B.
焊接电弧电压是随着电弧长度增加而变高
C.
焊接电弧电压是随着电弧长度增加而变低
D.
电弧电压的高低主要取决电源空载电压
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