The common faults of S1240(ELC type)SPC exchange are in user mod ul e, relay module and metering module in daily maintenance work.是什么意思_The common faults of S1240(ELC type)SPC exchange are in user mod ul e, relay module and metering module in daily maintenance work.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句