| 1. | Pure substance normally have sharp melting points .
纯质在正常情况下有鲜明的熔点。 |
| 2. | When it is struck , a tuning fork produces an almost pure tone , retaining its pitch oer a long period of time
音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。 |
| 3. | When it is struck , a tuning fork produces an almost pure tone , retaining its pitch over a long period of time
音叉被敲击时，产生几乎纯质的音调，其音量经久不衰。 |
| 4. | When it is struck , a tuning fork produces an almost pure tone , retaining its pitch over a long period of time
音叉被敲击时，产生几乎纯质的确是的音调，其音量经久不衰。 |
| 5. | Therefore , it shows that mixture replacing pure substance has advantage of energy savings in low temperature environment
显示了混合工质替代纯质在低温工况下的节能优势。 |
| 6. | Layerable waxes are primarily pure waxes , or protectants ( as synthetic formulas are referred to ) that do not contain chemical cleaners , or solvents that will remove the previous layer
分层蜡主要是纯质的蜡或保护剂（像合成的配方） ，它不包含化学清洁剂或溶剂，它们可去除以前的蜡层。 |
| 7. | At the same equipment and the same working conditions , compare performances of three kinds of systems , which use r22 , mixture r32 / r134a with a composition of 30 / 70 ( mass ) and variable composition mixture r32 / r134a as refrigerants respectively
3在理论上，比较了同一装置相同工况下纯质r22 、定比例组分混合工质r32 r134a以及变浓度混合工质r32 r134a三类系统的性能。 |
| 8. | It is proved that variable capacity of mixture has obvious advantages comparing to limitative composition systems of pure substance and mixture , and it is a feasible method by controlling low pressure , which can be used to vary mixture composition . 4
得出相对于纯质和定比例混合工质系统而言，变浓度混合工质系统具有明显的优势，以及采用吸气压力控制法来改变混合工质的浓度配比是可行的。 |
| 9. | Comparing with the system of r22 at the same working condition , it is indicated that heating capacity and work consumption of the system of ( 30 / 70wt % ) r32 / r134a are inferior to that of the former , but its heating cop is higher than the former at the lower temperature condition
并对相同工况下，两种工质的系统进行了性能比较。结果表明：与纯质r22系统相比，采用混合工质( 30 70wt ) r32 r134a的系统吸热量和制热量要低，耗功量要小，制热系数在低温工况下要高。 |
| 10. | Thome correlation has good precison in calculating heat transfer coefficients of r404a inside horizontal microfin tube . 3 . the analyses on different empirical formulations of in - tube boiling heat transfer coefficients indicate that r404a can be treated as pure refrigerant during calculating its the in - tube boiling heat transfer coefficients
对近共沸混合工质r404a ，通过对光管和内螺纹管沸腾换热系数关联式的分析计算得出结论：在计算r404a的光管和内螺纹管沸腾换热系数时可以被作为纯质来处理。 |
