[单选题]启动多台异步电动机时，可以( )。
A.一起启动
B.由小容量到大容量逐台启动
C.由大容量到小容量逐个启动
D.一齐启动

When I was in 7th grade, I had a lot of trouble in reading. My mother used to sit by my side, and explain each paragraph of each school reading assignment to me because I didn’t understand what I was reading. She would have to read each paragraph to me, and then after each paragraph, she told me the general meaning of what we just read.
In class, I tried to hide the fact that I couldn’t read. My teachers gave us the last 10 minutes of class to start our reading homework, and I would sit there for the last ten minutes of class staring at the page, pretending I was reading it. I remember a terrible feeling of not wanting to get into trouble for not being able to understand. I had to wait until I got home so my mother could explain it to me. How did I ever get into Cornell University
By eighth grade I started understanding a little on my own, but I was reading at a very slow speed. In eighth grade, I got hold of all the speed-reading books I could
A. one's comprehension drops if one reads too slowly
B. in order to understand better, one has to read slowly
C. one does not pay enough attention to information if one reads fast
D. many people read fast in order to save time