Helical port also produces swirl by airflow interaction of valve gap and cylinder wall, so swirl number depends on helical line direction of relevant cylinder center.
螺旋气道通过气门间隙与缸壁的气流相互作用也产生涡流，因此，涡流数取决于相应气缸中心的螺旋线方位。
2
The processing method on rock wall between foundation pit of Chongqing World Trade Center and the branch opening of main line of Linti tunnel is introduced.
介绍重庆世贸中心深基坑和临梯干道支洞人防工程的岩石间壁处理方法。
3
Put the centerof the sealing seat and the hole in the wall in a line and according to Figure 3 select method a orb to support the rear of soot-blower.