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【单选题】
电阻点焊的焊接电流大时，焊点中间电极触头接触部分的颜色变深呈（）。A.
蓝色
B.
红色
C.
紫色
D.
白色
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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A.
control
B.
start
C.
carry on
D.
hold
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