【单选题】
由两以上匝数不同的线圈绕在一个构成闭合回路的铁心上组成的电气装置是___P19T100。
A. 变压器
B. 接触器
C. 继电器
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答案
A
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检查和保养电器时要切断电源，机车辅修、小修时要用___的压缩空气吹扫电器，或用毛刷、棉布擦拭电器，使各电器保持清洁干燥。P77T350
A. 200～300kPa
B. 300～350kPa
C. 400～550kPa
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