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【单选题】
反馈控制系统是指系统中有()。A.
惯性环节
B.
积分环节
C.
PID 调节器
D.
反馈回路
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皮皮学刷刷变学霸
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【简答题】等候乘坐公共汽车时，应该站在何处，依次排队?
【判断题】It was normal for Mr. Green to say sorry even though when he was not expected to say so.
A.
正确
B.
错误
【单选题】Which sentence from the section "Warmer Weather" explains WHY the Earth is getting warmer?
A.
Mr. Thoman says North Pole was warmer than normal this year.
B.
It was very warm in North Pole this October.
C.
They think it is because of the fuel we use.
D.
The energy is used for things like cars and lights.
【简答题】当代国际贸易发展具有哪些新的特点和趋势？
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