The effect mechanism of vacuum on the filling process was discussed.It shows that the vacuum can reduce the gas counterpressure in the casting mould cavity and improve the filling ability.是什么意思_The effect mechanism of vacuum on the filling process was discussed.It shows that the vacuum can reduce the gas counterpressure in the casting mould cavity and improve the filling ability.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句