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Zero-voltage switching
释义
See
Switched-mode power supplyTypes
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556 U.S. 568
556 U.S. 646
556 U.S. 662
556 U.S. 701
556 U.S. 729
556 U.S. 778
556 U.S. 81
556 U.S. 816
556 U.S. 868
556 U.S. 928
556 U.S. 938
556 (year)
5572320
(5573) 1981 QX
55737 Coquimbo
557 AD
557 CE
557 (number)
557th Moonlight Battery, Royal Artillery
557th Searchlight Battery, Royal Artillery
557th Tactical Air Support Squadron
557th United States Army Artillery Group
557 U.S. 1
557 U.S. 167
557 U.S. 193
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