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；
The result indicated that the molecular weight decreases, the grafting ratio and particle size increase with the increase of initiator concentration.
乳化剂浓度增大，分子量和接枝率变化不大，粒径则有下降趋势；
High-volume ratio: a compact design, small size, light weight, flexible and convenient to carry.
高容积比：紧凑设计，体积小，重量轻，携带灵活方便。
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