PgDn Cycle to the next camera position .

循环下一个视窗视角位置。

Under the above optimum conditions , the yield of PGDN is about 96.3 % , and the selectivity is nearly 100 % .

1,2-丙二醇二硝酸酯的收率达96.3%，选择性接近100%。

In order to solve the environmental pollution of synthesizing 1,2-propylene glycol dinitrate ( PGDN ) with propylene oxide ( PO ) as raw material and the mixture of nitric acid and sulfuric acid as nitrating agent , a new method for preparation of PGDN by nitrating PO with dinitrogen pentoxide ( N2O5 ) as a clean nitrating agent was presented . This reaction is environmental friendly with high atomic economy .

为解决硝硫混酸法合成1,2-丙二醇二硝酸酯（PGDN）过程中存在的环境污染问题，提出了N2O5硝化环氧丙烷（PO）制备1,2-丙二醇二硝酸酯的方法，该反应原子经济性高，环境友好。

Reclaim your PgUp and PgDn keys from the Flash player to scroll the entire page , or add the cnee record mouse option to re-enable your scroll wheel .

从Flash播放器取回PgUp和PgDn键来滚动整个页面，或添加cneerecordmouse选项重新支持滚轮。