Factors affecting constant pressure difference control method and advantages and disadvantages of the control plan are analyzed theoretically through pipe system head curve and pump performance curve.

根据管道水力特性曲线与水泵的性能曲线，运用理论分析的方法，对影响末端定压差控制方式的因素和该控制方案的利弊进行了分析。

youdao

Uruguay has a microchipping system for cattle, which costs $20 a head.

乌拉圭关于养牛有着通过微型芯片跟踪的系统，其花费为每头牛20美元。

youdao

Head trauma, central nervous system infections and tumors are associated with secondary epilepsy.

头部外伤、中枢神经系统感染和肿瘤与继发性癫痫有关。

youdao

The head of the center's office dealing with the nervous system said nobody else knew about it,either.

VOA: special.2010.05.04

Rather, what happened is you heard English and--but the capacity grew in your head and something a lot more similar to the development of arms or legs or a visual system.

相反,你听到了英语,你脑中的英语能力得到增长,这个和手臂,下肢,或是视觉系统的发育很相似

耶鲁公开课 - 心理学导论课程节选

The head of Raptorex Kriegsteini shows evidence of a well-developed olfactory system.

VOA: special.2009.10.13

The union also claims that there has not been enough testing of the IT system which head teachers say will be "essential" to the Diplomas.

BBC: Heads demand answers on Diplomas

The eye tracking system supports leading head and motion tracking technologies such as A.R.

ENGADGET: SMI Eye-Tracking 3D Glasses use rim-based cameras to adjust perspective

Instead of building cars for stock, he is turning the production system on its head.

ECONOMIST: General Motors and Fiat