在速度电流双闭环直流调速系统中，电源电压波动造成的干扰，主要靠（）消除。A、速度调节

阅读理解

     Food is very important. Everyone needs to eat well if he wants to have a strong body.

Our minds also need a kind of food. This kind of food is knowledge(知识).

     When we are very young, we start getting knowledge. Kids like watching and listening.

Color pictures especially interest them. When kids are older, they enjoy reading. When

something interests them, they love to ask questions.

     Our minds, like our bodies, always need the best food. Studying on our own brings the

most knowledge.

     If someone is always telling us answers,we never learn well. When we study correctly

(正确地) and get knowledge on our own, we learn more and understand better.

1. Everyone needs to eat well because it can help people __________.

A. to be healthy

B. to study well

C. to enjoy learning

D. to have a happy life

2. Our bodies need __________.

A. books

B. rice

C. food

D. drink

3. We start getting knowledge __________.

A. when we are old

B. when we are very young

C. when we are pupils

D. when we are parents

4. How do kids get knowledge?

A. They watch.

B. They eat.

C. They listen to the teacher.

D. They just learn by themselves.

我国唐代的著名和尚慧能认为，一切运动都不过是人们主观意识的变化。这一观

点

A．是正确的，因为它肯定了事物的运动变化

B．承认物质和运动是不可分割的

C．认了物质运动过程中存在着相对静止

D．一种离开物质谈运动的唯心主义观点

第16届亚洲运动会于2010年11月12日至27日在广州隆重举行。广州亚运会开幕式文艺表演以珠江为舞台，以水为主题，展示了广州乃至岭南独特的地域文化特色。闭幕式文艺表演凸显了亚洲元素，歌颂了亚洲各国各地区人民之间的友谊，展示了亚洲多元文化的魅力。

农业是地域文化的重要组成部分。广州附近的农业地域类型是（），利雅得附近的农业地域类型是（）。

读北纬52°某地附近的相关等值线图，回答下列各题。

该地区最高点的海拔大致范围在（）

A．1500m～1800m

B．1200m～1500m

C．900m～1200m

D．1800m～2100m

为什么乳化液的液面高度要高出泵体？