皮皮学，免费搜题
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搜题
【单选题】
使用 1 .0mm 的焊丝进行 MAG 焊接,其伸出长度应约为 _______ 。A.
5 mm
B.
10mm
C.
20mm
D.
30mm
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
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