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【单选题】
直流电机可逆原理是指( )A.
直流电机既可以正转运行也可以反转运行。
B.
直流电机接线端子可以随意反接而不影响电机运行状态。
C.
直流电机既可以接正电压运行也可以接负电压运行。
D.
直流电机既可以作为电动机运行,也可以作为发电机运行。
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A.
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B.
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C.
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