在调速范围中规定的最高转速和最低转速，它们都必须满足静差率所允许的范围，若低速时静差率满足允许范围，则其余转速时静差率自然就一定满足
参考答案：对
—Could you Tell me __________?
—Because I want to help the people there. [ ]
A. why do you go to Tibet
B. why did you go to Tibet
C. why are you going to Tibet
D. why you are going to Tibet
在茶楼里，当客人需要续水时，只要把壶盖打开，服务员便会意而来。这一由来是什么？
