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汉语拼音：rè céng

从中间层顶至约250千米(太阳宁静期)或约500千米(太阳活动强烈期)高度的大气层。层内温度随高度增高而迅速升高，太阳紫外辐射被该层的大气大量吸收，从而使该层加热。热层顶处温度不再随高度而变化。层内大气处于高度电离状态。

• The temperature rises rapidly to between 500 k and 2000 k in the region known as the thermosphere.

  在称之为“热层”地区域内,温度很快上升到500K与2000K之间.

• Investigated charring erosive characters of internal insulation of solid rocket motor under flight acceleration.

  研究了固体火箭发动机内绝热层在飞行加速度条件下的炭化烧蚀特性.

• An experimental method of dynamic erosion of insulation was developed with RTR technique.

  3发展了运用RTR技术开展绝热层动态烧蚀的实验方法.

• Melamine phosphate is the key material to guarantee the comprehensive performances for insulting layer.

  三聚氰胺磷酸盐是保障绝热层综合性能的关键材料.

• The experiment result can use to internal insulation design of solid rocket motor.

  实验结果可作为发动机绝热层设计的依据.

• The optimum properties of the set EPDM rubber insulation are as follows : density 1.

  确定最佳配方和工艺生产出的三元乙丙橡胶 绝热层 密度为1.

• In addition an insulation layer should be built in interior building structure for moisture proof.

  为防止结露,外保温建筑还应在建筑围护构造内侧设置一层绝热层.

• The effects of filler fiber and flame retardant on ablative performance of EPDM insulation are studied.

  研究了填充纤维、阻燃剂种类及用量对EPDM绝热层耐烧蚀性能的影响.

• This article introduces the application of DNCA type ammonia synthesis catalyst ammonia synthesis tower.

  分析氨合成塔下绝热层催化剂利用率低的原因,提出了提高利用率的措施以及实施效果.