The planetary mill can be used for the ultrafine comminution, when the mechanism size of the mill is determined, the escaping position of the critical speed of the grinding ball will not be changed.是什么意思_The planetary mill can be used for the ultrafine comminution, when the mechanism size of the mill is determined, the escaping position of the critical speed of the grinding ball will not be changed.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句