神马电影午夜第九理论_久久亚洲国产最新网站之一_狠狠v日韩√欧美v天堂_好爽又高潮了毛片_日本欧美综合观看_免费番茄社区性色大片_成品ppt的网站免费_亚洲色成人综合网站_日韩欧美亚洲一区中文字幕_91免费 无码 国产在线观看

stepper motor although there are many advantages, but the natural thing is that the shortcomings will be appropriate, and some, then, and small series together to see what shortcomings are there.
The main drawback is the following:
A. is normally difficult to run at higher speeds.
B. also has advantages in terms of size, weight, and low energy efficiency.
C. also destroys the synchronization when it exceeds the load, and then it emits vibration and noise at high speed.
D. is difficult to obtain a larger torque.
E. and that is, if the control is not good, it will easily resonate.