随着电力电子技术的发展，驱动电机的电力控制的体积越来越小，可实现高速高精度控制是（）的一个重要特点。
A.电机
B.传感器
C.机械
参考答案：A
用所给单词的适当形式完成句子。
1. Tom's father is ___ (two) as tall as him.
2. The oil now is even______(expensive) than before.
3. She was troubled because she had reached the ____ (weigh) of 180 pounds.
4. The______ (high) of the Qomolangma is 8,844 meters.
5. The heavy rain prevented us from ____ (come) in time.
豆类食物的最限制性氨基酸是（）
A.蛋氨酸
B.赖氨酸
C.苏氨酸
D.色氨酸
E.亮氨酸
