材料的孔隙率越小,则其( )
A campus emergency ______ occur at any time of the day or night, weekend, or holiday, with little or no warning.
判断题02..一般来说,材料的亲水性越强,孔隙率越小,连通的毛细孔隙越多,其吸水率越小。
免费的网站请分享给朋友吧