When using, fasten the hex nut to open the valve, SF6 gas enters the instrument via the valve, pressure is controlled slightly.After using, loosen the hex nut to cut off the gas.是什么意思_When using, fasten the hex nut to open the valve, SF6 gas enters the instrument via the valve, pressure is controlled slightly.After using, loosen the hex nut to cut off the gas.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句