单项选择题
A.锈蚀B.酸C.氧化皮D.灰尘
A.1950B.1960C.1970D.1980
A.浮锈B.点锈C.层锈D.死硬锈
A.0.1~0.2VB.0.15~0.2VC.0.15~0.26VD.0.1~0.26V
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