短語(yǔ)詞組短語(yǔ)Normally y open valve 常開閥normally y open interlock 工子點(diǎn)normally -open gate 常開門normally y open contact 常開接點(diǎn);常開觸點(diǎn)Normally y open 常開的;正常斷開的NO Normally Open 通常是打開的;常開的;常開normally open circuit 正常斷開電路normally open track circuit 開路式軌道電路 返回 normally open