hcfc

Phase ⅱ Clinical Study of HCFC in the Treatment of Breast Cancer

卡莫氟治疗乳腺癌的Ⅱ期临床观察

The thermal conductivity coefficients of HCFC 133a is measured by double hot wire technique .

用双热丝的瞬态热线法测量了HCFC-133a气相区和液相区的导热系数数据。

HCFC working fluid which is widely used by HVAC industry destroys the ozone layer and threatens the human survival .

制冷、空调行业广泛采用的氢氯氟烃类工质对臭氧层产生破坏，威胁人类生存。

Analyses the uncertainties of existing substitutes for HCFCs and the screening principles of future HCFC substitutes .

分析了现有HCFC替代物的不确定性和未来HCFC替代物的筛选原则；

Forced convective boiling heat transfer characteristics of HFC 32 / HFC 134a and HCFC 22 in a horizontal tube

HFC-32/HFC-134a和HCFC-22在水平管内的强制对流沸腾换热特性

Prohibition on production and use of HCFC working fluid , as well as seeking the new substitution working fluids , are the most urgent and popular research contents in the HVAC industry in recent years .

禁止生产和使用氢氯氟烃类工质、寻找新的替代工质，已经成为制冷及空调领域近年来最为迫切和热门的研究内容之一。

This paper discusses several kinds of natural refrigerants , outlines the development of natural refrigerants in the process of CFC / HCFC phase-out and gives prospects for the future of natural refrigerants .

本文对几种较受火注的自然制冷剂的性质进行了分析比较，概括了自然工质在CFC/HCFC替代过程中的发展状况，并展望自然制冷剂的应用前景。

Hydrochlorofluorocarbon - HCFC : A substitute for chlorofluorocarbons .

氢氯氟烃（简写为HCFC）：一种氟氯烃的替代物。

Propane ( HC 290 ), as a kind of air conditioning refrigerant , is a good choice in substitutes of HCFC 22.Propane ( HC 290 ) has a smaller Filling volume , higher energy efficiency and better economy than HCFC 22 .

丙烷（R290）是空调制冷剂R22的一种非常优良的天然替代物，具有比R22更小的充灌量、更高的能效比和更好的经济性。

The Lowest Observed Effect Concentration ( LOEC ) is 37 350 mg / m 3 . The No Observed Effect Concentration ( NOEC ) is 12 450 mg / m 3 . [ Conclusion ] HCFC 225 belongs to slight toxicity grade .

最小毒作用浓度（LOEC）为37350mg/m3，未观察到毒作用浓度（NOEC）为12450mg/m3。[结论]二氯五氟丙烷（HCFC225）的急性毒性属于微毒；

The ozone in the stratosphere of the earth can effectively absorb the solar UV radiation , which protect the life on the earth from harm of ultraviolet radiation . However , with the rapid development of modern industry , the concentration of HCFC compounds is increasing year by year .

地球大气平流层中的臭氧层对太阳中的紫外线有较强的吸收作用，从而保护地球上的生物免受紫外线辐射的伤害。但伴随着现代工业的迅速发展，大气中氟氯烃类化合物浓度在逐年增加。