If specified by the customer, Velan valves can be furnished with mounting pads for most steel cylinders or valve positioners for throttling control.是什么意思_If specified by the customer, Velan valves can be furnished with mounting pads for most steel cylinders or valve positioners for throttling control.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句