A piston engine is said at best to be only 33% efficient.
一台活塞式发动机被充其量说只成为有效率33%。
Only small aircraft, and those needing tough low-speed propulsion at low altitudes, for agricultural work and fire-fighting, still have piston engines.
只有一些小型的飞机，以及那些用于在低空低速爬升飞行的用于农业以及灭火用途的飞机仍然使用活塞发动机。
Teflon Piston-ring integrated with piston, not only reduce the friction and noise, but also avoid inner-leakage.
特氟龙材料的活塞环与活塞熔接成一体不仅减磨效果好，同时能减少噪音防止内泄。
The bending of pump barrel will not happen as low part fixed pumping piston going downward that only happens when it works in heavy oil well.
而泵筒下部固定泵柱塞上行时，泵筒不会发生弯曲，只是其柱塞在稠油井中下行时泵筒才会发生纵向弯曲。
The experiments showed that RE-containing inoculant not only increased mechanical properties of piston rings, but also reduced the consumption of alloying elements and cost of production.
试验结果表明，采用稀土复合孕育剂，不仅可以提高活塞环的机械性能，而且可以减少合金元素用量，降低生产成本。
The members include not only piston and piston pin manufacturers, but also academic institutes, colleges and universities, special machine and assistant material manufacturers.
会员的组成除了有活塞、活塞销生产单位外、还有科研和大专院校、专机和辅料生产单位等。
The utility model could not only be used in electric stove swaying cylinder but also could be used in other cylinder in a high temperature environment to protect piston rod.
本实用新型不仅用在电炉横 移油缸上，也可以用于其他高温环境的油缸上用于保护活塞杆。
Therefore, the fluid differential circuit can not only increase the speed of the no-load operation of the piston rod in the system, but also save energy, and prolong the service life of the system.
因此，该流体的差动回路既可提高系统中活塞杆空载运行的速度，又可节能，延长系统使用寿命。
The rotating ramjet is a new conceptive engine based on the ram-compressed technology without any blade or piston but only a ram-compressed rotor is used as its moving core component.
旋转冲压发动机是一种全新概念发动机，采用激波增压和驻涡燃烧技术，其显著的高效、低污染特性引起越来越多人关注。
The rotating ramjet is a new conceptive engine based on the ram-compressed technology without any blade or piston but only a ram-compressed rotor is used as its moving core component.
旋转冲压发动机是一种全新概念发动机，采用激波增压和驻涡燃烧技术，其显著的高效、低污染特性引起越来越多人关注。
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