- 单: singular number fate; destin ...
- 母线: bus; bus bar; bus line gener ...
- 单母线系统: single busbar system; singlebusbarsystem
- 单母线制: single bus system
- 母线: 1.[电学] bus; bus bar; bus line2.[数学] generating line; generator; generatrix3.generant; main lead; omnibus bar; omnibus rod; trunk
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