Engineering Plastics QBY pneumatic diaphragm pumps do not need lubricating oil, even if the idling of pumps have no impact, this is a major characteristic of the pump.是什么意思_Engineering Plastics QBY pneumatic diaphragm pumps do not need lubricating oil, even if the idling of pumps have no impact, this is a major characteristic of the pump.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句