单级

The requirements for the specific impulse and mass-to-thrust ratio of the bipropellant and tripropellant engine are studied, and the calculated isolines of vehicle dry mass variation with the average engine specific impulse and the sea-level engine mass-tothrust ratio are also given.

探讨了单级人轨运载器对液氧／液氢发动机和液氧／煤油／液氢三组元发动机比冲和质推比的需求，计算给出了运载器干质量随发动机比冲和质推比变化的等值线图。

Single-class character, remote power switch, line system, radio, wireless remote control, circuit design.

单级性，遥控电源开关，一线制，无线电，无线遥控，电路设计

As a result, at temperatures from 0.6 to 2 Kelvin, the strings are visible and have magnetic monopoles at their ends.

最后的结果，温度在0.6k到2k之间，弦是可以被看见的，而且在他们的尾部就是磁单级子。

The definition of multigrade hydraulic oil, specification, components and energy saving were introduced, compared the difference between multigrade hydraulic oil and monograde hydraulic oil, and the marketing demand of multigrade hydraulic oil was presented.

介绍了多级液压油的定义、格、方等内容，对多级液压油的主要标准进行了说明，比较了单级液压油和多级液压油在使用上的差别以及多级液压油在节能方面的研究进展，并对中国未来多级液压油的应用和市场需求作了概述。

At 100 C SAE 15W-40 and SAE 40 oils will have similar viscosity - BUT above 100C the multigrade oil will remain thicker than the SAE 40 providing even better protection than the monograde oil.

在100摄氏度下，SAE 15W-40和SAE 40润滑油具有类似的粘度–但是在100摄氏度以上，多级润滑油会比SAE 40更稠厚，从而能够提供比单级润滑油更好的保护功能。

Use of quality multigrade oils (eg Rimula X 15W-40) will provide 2-3% reductions in fuel consumption compared to monograde oils.

与单级润滑油相比，使用高质量的多级通用润滑油比如劲霸(Rimula X 15W-40可以降低 2-3%的燃油消耗。

At 100 C SAE 15W-40 and SAE 40 oils will have similar viscosity - BUT above 100C the multigrade oil will remain thick er than the SAE 40 providing even better protection than the monograde oil.

在100摄氏度下，SAE 15W-40和SAE 40润滑油具有类似的粘度–但是在100摄氏度以上，多级润滑油会比SAE 40更稠厚，从而能够提供比单级润滑油更好的保护功能。

The present invention relates to a reduction box mainly composed of coaxial line input shaft, output shaft, internal ring gear, eccentric toothed plate engaged with the internal ring gear and pin shaft.

本发明涉及一种同轴输入输出单级齿轮差齿减速箱，该减速箱主要由同轴线的输入轴1、输出轴7、内齿圈6，与内齿圈6啮合的偏心齿片5、销轴3等构成。

The classification,main modes,scope of application,advantages and defects of city natural gas transmission and distribution network are compared,the principle for selecting gas transmission and distribution network is put forward,and the application of regulator box and PE pipe in a medium-pressure single stage system is discussed.

对城镇天然气输配管网分级、主要型式、适用范围、优缺点进行了比较，提出了燃气输配管网选择原则，探讨了调压柜和PE管在中压单级管网系统中的应用。

Finally, the numerical investigation of shock wave compression passage and the analysis of flow characteristics are performed and it is concluded that the pressure ratio of single stage may be equal to nine.

最后，通过对激波压缩通道进行了流场数值模拟，对其流道内的气动特性进行了分析，得出其单级压比可以达到9，充分显示出其优越的高压比特性。

We have no common name for a mime of Sophron or Xenarchus and a Socratic Conversation; and we should still be without one even if the imitation in the two instances were in trimeters or elegiacs or some other kind of verse--though it is the way with people to tack on 'poet' to the name of a metre, and talk of elegiac-poets and epic-poets, thinking that they call them poets not by reason of the imitative nature of their work, but indiscriminately by reason of the metre they write in.

索夫农 、森那库斯和苏格拉底式的对话采用的模仿没有一个公共的名称；三音步诗、挽歌体或其他类型的诗的模仿也没有——人们把&诗人&这一名词和格律名称结合到一起，称之为挽歌体诗人或者史诗诗人，他们被称为诗人，似乎只是因为遵守格律写作，而非他们作品的模仿本质。

The relationship between communicative competence and grammar teaching should be that of the ends and the means.

交际能力和语法的关系应该是目标与途径的关系。