On the basis of theoretical calculation analysis and experiment research, the paper proposes a new raising non-con-control rocket distrubution way. which is a step propulsion plan.
本文在理论计算分析和试验研究的基础上提出了提高无控火箭密集度的一个途径，即阶梯推力方案。
A few proposals on the way of controlling nitrate con tent and increasing yield of vegetable and the direction of research in the future were put forward.
针对控制蔬菜硝酸盐含量，提高产量的途径及今后研究的方向提出了建议。
The authors of this article have done some research work on natural con - vection heat transfer of a radiator of round steel series of slice.
对圆形钢串叶散热器自然对流换热的规律进行了试验研究。
The authors of this article have done some research work on natural con - vection heat transfer of a radiator of round steel series of slice.
对圆形钢串叶散热器自然对流换热的规律进行了试验研究。
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