练泥
用真空练泥机或其他方法对可塑成型的坯料进行捏练,使坯料中气体逸散、水分均匀、提高可塑性的工艺过程。
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
免费的网站请分享给朋友吧