多选题:交一交变频器(电压型)和交一直一交变频器各有特点,下列哪几项符合交一交变频器的特点?( )

题目内容:
交一交变频器(电压型)和交一直一交变频器各有特点,下列哪几项符合交一交变频器的特点?( ) A.换能环节少
B.换流方式为电源电压换流
C.元件数量较少
D.电源功率因数较高

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