U-shape gland seal system can bring persistance and good seal effect, so the U-shape gland device has been used in the insulating joint products wildly.是什么意思_U-shape gland seal system can bring persistance and good seal effect, so the U-shape gland device has been used in the insulating joint products wildly.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句