Most British power stations generate A. C.(alternating current) with a frequency of 50 cycle per second,written 50 c/s far short.是什么意思_Most British power stations generate A. C.(alternating current) with a frequency of 50 cycle per second,written 50 c/s far short.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句