?备用电路

... stand-by boat 守护船 stand-by circuit 备用电路 stand-by compressor 备用压缩机 ...

?附加电路

附加电缆 building-out cable; 附加电路 adjunct circuit; applique circuit; building-out circuit; stand-by circuit; 附加电容器 building-out condenser; ..

?后备电路

... 后备电池 back up battery; batter backup; 后备电路 stand-by circuit; 后备电源 back-up source; ...