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  3. According to the passage, scientists used to think that the X-rays were produced

According to the passage, scientists used to think that the X-rays were produced

游客2024-07-10  12
问题 According to the passage, scientists used to think that the X-rays were produced by ______. [br] Which of the following statements is true according to the passage?
选项 A、All the researchers doubt that X-rays can be produced by sparks at first.
B、X-rays produced in lab is just the same with those by lightning.
C、The result of the study is in expectation of every researcher.
D、The researchers detected X-rays in sparks of 1.5 million to 2 million volts.
答案 D
解析 本题考查阅读细节。在第四段即提到在实验过程中产生火花的电源伏特数。其他选项皆为对原文的错误描述。
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