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当前学科：电力机车司机技师考试
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DK-1型电空制动机具有：双端操纵、非自动保压式、失电制动、结构简单，便于维修、与其他系统配合、控制列车电空制动、兼有（）两种功能的特点。
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按照关税形式和程度，关税可分为哪几类?
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