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【判断题】
世界卫生组织(WH0)根据对世界长寿地区的大量调查结果进行分析,提出优质饮用水的 7条标准。A.
正确
B.
错误
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举一反三
【单选题】听力原文： The origin of Earth's moon, the largest moon in the solar system, is still something of a mystery. There are some theories about its origin however. Now, keep in mind that a theory of the moon's...
A.
Differences between the planets in the solar system.
B.
Methods of determining the composition of Earth and the Moon.
C.
Why Earth has an iron core.
D.
The origin of the Moon.
【单选题】听力原文： The origin of Earth's moon, the largest moon in the solar system, is still something of a mystery. There are some theories about its origin however. Now, keep in mind that a theory of the moon's...
A.
In a geography class.
B.
In an astronomy class.
C.
In a geology class.
D.
In a biology class.
【简答题】二极管P区对应的电极叫做(),N区对应的电极叫做()。
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