All switch contacts shall normally be double-pole double throw (DPDT), Form C, hermetically sealed (when available), rated for 1 ampere minimum at 24VDC.是什么意思_All switch contacts shall normally be double-pole double throw (DPDT), Form C, hermetically sealed (when available), rated for 1 ampere minimum at 24VDC.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句