基本解释[經濟學]屏蔽變壓器词组短语短語shielded d transformer 屏蔽變壓器oil gas shielded type transformer 充油封閉式變壓器super shielded transformer 超隔離efficacy measurement of shielded transformer 屏蔽傚能測試专业释义經濟學屏蔽變壓器