试验和分析木工平刨床空转和切削时的噪声源、噪声频率特性和各种降噪方法。
Testing and analyzing the noise source of idle run and cutting, noise frequency characters and all kinds of methods for noise reduction for the surface planer were carried out.
研制后者的目的，在于改善现有中空转子螺杆钻具的软特性和低效率。
The purpose for the later is to improve the existing rotor screw drill for high efficiency. Subject heading: horizontal drilling screw drill tool control bending sub st...
应用推荐