When numbers of the inner nozzle are enough, plug nozzle has less size, less weight and higher thrust efficiency than the bell nozzle under same area ratio.
在单元数足够多时，环簇式塞式喷管可比相同面积比的钟形喷管的尺寸更小，重量更轻，推力效率更高；
2
The results showed that in the same reaction system if the reactant particle size was same (or different) changing the reactants ratio had different effect on reaction velocity.
实验结果表明：在同一反应体系中，如果反应物的颗粒尺寸相同（或不相同）时。
3
At the same time, the stability of big-span tunnel with influence factor such as section size, high-span ratio and depth is studied.