问题
单项选择题
手工电弧焊用交流弧焊机空载输出电压多为( )V。
A．25～35
B．60～75
C．110～220
D．220～380
答案
参考答案：B
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手工电弧焊用交流弧焊机空载输出电压多为( )V。
A．25～35
B．60～75
C．110～220
D．220～380
参考答案：B
| 根据句子意思，用所给动词的适当形式填空。 | |
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