这样就避免了使用传统的螺旋轴，将螺旋桨置于干净的水流中，从而大大提高了效率。
This avoids the use of a traditional propeller shaft and puts the propellers in a clear flow of water, which greatly improves efficiency.
是的，螺旋桨转动效率很强。
船用螺旋桨是一类典型的自由曲面零件，它的设计和制造精度直接决定了其推进效率。
Marine propeller is a type of free form surface part. Its design and manufacture precision decide ship's thrust efficiency directly.
某些水泵使用1000小时左右即出现严重的空蚀，船舶螺旋桨在使用一段时间后也因空蚀而效率大大降低。
Some pumps used for 1000 hours, the ship propeller in the use of time is also greatly reduced because of the efficiency of air piping.
试验结果表明，桨、舵球间距的变化对螺旋桨敞水效率的影响是明显的。
The test results indicated that the variation of the spacing between propeller and rudder bulb has obvious effect on propeller open water efficiency.
该螺旋桨不仅有利于提高船舶推进系统的效率，而且能产生较大推力。
The propeller is not only favorable to enhance the efficiency of marine propulsion systems, but also can generate large pushing force.
该文阐述了螺旋桨空泡的形成机理，对其产生的噪声及其噪声谱作了分析；阐述了激光空泡噪声的原理，分析了激光产生噪声的转换效率。
This article elaborated the formation mechanism of propeller cavitation, the noise and the cavitation noise spectrum which produced by the bubbles were analyzed.
它们使用的操纵和控制系统大多是由多个螺旋桨推进器组成的，这样的系统体积大、重量大、能耗高、综合效率低，并有较大的噪音和尾涡。
Their maneuvering and control systems are made up of several propellers. This system has many disadvantages such as big volume, high consuming of energy, low total efficiency , high noise and vortex.
导管螺旋桨优势在于低航速时提供更大的推力和更高的推进效率，因此作为首要选择。
The advantage of the ducted propeller is, this type propeller can support greater thrust and higher efficiency under low speed, so is the first choice.
lowly答案b螺旋桨，为了更有效率的工作，必须以相对较低的速度旋转。
A propeller, in order to operate efficiently, must rotate at a relatively speed. A. high B. low C. fast d.
lowly答案b螺旋桨，为了更有效率的工作，必须以相对较低的速度旋转。
A propeller, in order to operate efficiently, must rotate at a relatively speed. A. high B. low C. fast d.
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