1.In this paper,by means of application of hydro simulating method of two phase fluid,effect of runer structure on drag collection was discussed.

1.应两水模拟试验方法，研究了浇注系统中横浇道结构形式其集渣效果影响。

2.Conclusion Anatomic variations of ostiomeatal com plex are common findings.Using coronal position together with naphazoline hydro chloride dropping is of first choice in CT examination.

2.结论解剖变异是较常见现象，首先采位扫描，并滴鼻净方法较好。