We should not underestimate the effects of outside competition and also should strengthen supervision and management from the government . with regards to the railway management model , this paper figures that , considering the reality of our transportation systems , we can choose a mixed model named " separation of infrastructure from operation + regional companies " and at the same time , we should effectively deal with the matter of ' way access authority " 关于铁路运价政策的问题，本文分析了铁路的垄断性对运价的影响，认为，放开铁路运价后铁路形成垄断价格的可能性不大，因此不会导致铁路运价的上涨;分析了铁路运价的机理，阐述了运能对运价影响的间接性和不确定性，运量对铁路运价影响的直接性、周期性和双向性，竞争对运价影响的抑制性和不平衡性。
On the basis of summarizing the existing large - span slab structure forms , the author developed the existing circular voided slab into a new large - span slab system , rc bi - direction cellular slab , which , specialized itself as bi - direction from a macro point of view , could not only reduce the tare weight of slab , but also expand slab span 本文在总结已有大跨度楼板结构形式的基础上，提出了一种新型的大跨度楼板体系? ?钢筋混凝土双向空腹板，该类楼板体系是现有圆管式空心楼板的延伸，不仅能减轻楼盖自重、增大板跨，而且还具有宏观上双向性的优点。
The results indicated : 1 ) 521 genes up - regulated and 92 genes down - regulated under acute hyperglycemia , while 294 genes up - regulated and 464 down - regulated under acute hypoglycemia ; 1208 genes expressed differentially between acute hyperglycemia and hypoglycemia , including 94 genes expressed bi - directionally ; 2 ) bbs4 gene , which mainly expressed in the adrenal medulla , was up - regulated by hyperglycemia and down - regulated by hypoglycemia ; 3 ) 79 genes up - regulated and 43 down - regulated under chronic hypoglycemia , 725 genes expressed differentially between acute and chronic hyperglycemia , including 2 genes expressed bi - directionally 结果显示： ( 1 )在急性高血糖情况下有521个基因上调， 92个下调，急性低血糖情况下294个上调， 464个下调；差异表达的基因共1208个，其中双向性表达基因94个； ( 2 )在急性高低血糖情况下， bbs4基因呈双向性表达，原位杂交发现其主要表达在肾上腺髓质； ( 3 )慢性高血糖情况下， 79个基因上调， 43个下调，差异表达基因725个，其中双向性表达基因2个。
And , since vestibular centre amid is pair of tropism adjustment functions , a side sound that if convey , comes in namely believes date slacken , the vestibule comes out the system removes those who enhance signal to adjust action ; if a side signal increases , the adjustment that it removes abate signal action , maintain balance sense of the person with trends 而且，前庭中枢在其中起的是双向性调节功能，即若传送进来的一侧声音信号变弱，前庭传出系统便起增强信号的调节作用；若一侧信号增强，它便起减弱信号的调节作用，以动态维持人的平衡感。
