The flange gasket bolts for the gate valves should be retightened during installation as the bolts may have loosened due to storage and shipping.是什么意思_The flange gasket bolts for the gate valves should be retightened during installation as the bolts may have loosened due to storage and shipping.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句