Warning: file_put_contents(/home/www/wwwroot/zidian/69228.com/cache/6412dc8c672d8b224e4c0688e20d8adc.txt): failed to open stream: No space left on device in /home/www/wwwroot/zidian/69228.com/index.php on line 55 欧美老肥妇多毛XXXXX,亚洲精品无码喷水白浆av
1. N the volume of an incompressible fluid that will flow in unit time through a unit cube of a porous substance across which a unit pressure difference is maintained 滲透系數(shù)