propulsion 雅思GRE

A four-joint flexible underwater pisciform propulsion system is developed and the control flow chart is presented.

设计了四关节柔性水下仿鱼形推，出了控制流程图，建立了运学方程。

2 Class B: AIRSHIP or DIRIGIBLE -An aerostat, equipped with means of propulsion and steering.

飞船或飞艇—浮升之一种，配备有推方法和操纵舵。

In addition, the USAF continues to fund development work of the Aerojet (formerly Atlantic Research) Variable Flow Ducted Rocket ramjet system as a future propulsion option for an extended range AAM.

此外，美国军继续投资于航喷研究所（原来的大西洋研究所）的可变喷流管火箭发机系统，将其作为增程导弹的未来推选项。