Warning: file_put_contents(/home/www/wwwroot/ndsq.cn/cache/b3a3edf30e71b9372bf1d67413bcd0e5.txt): failed to open stream: No space left on device in /home/www/wwwroot/ndsq.cn/index.php on line 55 overburden separated strata例句_overburden separated strata英汉例句_overburden separated strata双解例句_开心英文字典_柠咚词
The mechanics model of the pressure balance arch in overburden is founded, that is necessary to calculate the sizes of separated strata rock layers. 建立覆岩内压力平衡拱迹线的力学模型，计算离层岩板的尺寸；