If a switch is operated at the rate of 10 cycles per minute, at least 10 banks of lamps controlled by a commutator shall be used for each switch under test.是什么意思_If a switch is operated at the rate of 10 cycles per minute, at least 10 banks of lamps controlled by a commutator shall be used for each switch under test.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句