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【简答题】
在电场的某区域里,如果各点的电场强度大小和方向都相同,这个区域的电场就叫做 。它是一种 的实体模型。
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反馈参考答案：
举一反三
【单选题】Which of the following would be the most appropriate title for the text?
A.
The Earliest Memories
B.
Earliest Memories, Good or Bad
C.
The Power of Earliest Memories
D.
How to Recall Earliest Memories Better
【单选题】The earliest method of delivering telecommunications is the ______．
A.
telegraph
B.
telephone
C.
e-mail
D.
letter
【单选题】Which is the best title of this passage?
A.
The Earliest People in North America．
B.
The Earliest Immigrants to North America．
C.
The People of the United States．
D.
Europeans were the Earliest People Coming to the North America．
【简答题】红移现象
【简答题】Where and when was the earliest daily newspaper started? It was started in __________in__________.
【简答题】(3分)红移现象(red transition)
【单选题】Which of the following was the earliest trade route?
A.
Which of the following was the earliest trade route?
B.
The Internet
C.
Land routes
D.
Air routes
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