频率调节

The bottom plate structure of screen box can be converted in order to improve grading ability.(5) It can adjust vibration frequency of screen boxes productivity and separation rate as needed.

筛箱底板结构可以转换，使分级能力提高；（5）筛箱振动频率可调，生产率和分离率可根据需要进行调节。

In the paper,using three methods,including C language,Matlab and DSP Builder,producing the arbitrary waveform initialization data of the sine wave,the triangular wave,the saw-tooth wave and the square-wave.Programming,parameter setting and waveform simulation are described to every method detailedly.

DDS系统一般包括系统时钟、频率预置与调节电路、相位累加器、ROM查找表，输出的数据通过外接的D/A转换器和滤波器完成波形输出。

So it can adjust the strike energy and frequency independently and steplessly. The new kind hydraulic rock breaker can operate under vary conditions and develop the operation efficiency.

由于实现了冲击器冲击能和冲击频率的独立无级调节控制，使碎石机能适应各种工况的需要，提高了工作效益。

The primary frequencyregulation has direct effect on the grid frequency, and it is very important to maintain thestability of power systems.

一次调节直接影响电网的频率质量，对电网的稳定起着重要的作用。

I am sure after a few weeks of adaptation and familiarization I will have no difficulty in functioning on a daily basis in an English speaking society or in participating fully in graduate studies.

在大学的三年的学习生活不仅给予我自身的充实，更重要的是磨练和培养了我较强的自觉能力和严谨，踏实的作风以及不怕困难的精神，对未来充满了信心！

As the first volcanoes erupted, one of the gases that bellowed out was steam.

在第一批火山喷发时，喷出的气体之一就是水蒸汽。