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【判断题】
PH值的测定 量取100ml水样,按照GB/T9724的规定,测试水样的PH值。()A.
正确
B.
错误
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【单选题】What does the man mean when he says this:
A.
He wants to change the topic of the talk.
B.
He wants the professor to elaborate on a point in the lecture.
C.
He is trying to remember something the professor already said.
D.
He wants to correct some mistakes that the professor made.
【单选题】建筑物内电气柜发生的火灾是____火灾
A.
建筑物内电气柜发生的火灾是属于____火灾。 A．C类火灾
B.
D类火灾
C.
E类火灾
D.
F类火灾 本题为单选题，麻烦解答一下，谢谢!
【单选题】当外界存在一个很强的干扰信号，由于收信机的非线性仍能造成对有用信号增益的降低（受到抑制）或噪声提高，使接收机灵敏度下降，这种干扰称为（）。
A.
同频道干扰
B.
邻道干扰
C.
杂散辐射干扰
D.
阻塞干扰
【单选题】听力原文： US President George W. Bush says he recognizes human beings contribute to global climate change but he remains unyielding in his opposition to the Kyoto Accord on the issue. Bush made the remark...
A.
To call on more effort to reduce human beings' contribution to global climate change.
B.
To include more developing countries into the Accord.
C.
To continue to oppose to the Accord.
D.
To sign the treaty to cut emissions of carbon dioxide.
【简答题】当外界存在一个很强的干扰信号,由于收信机的非线性仍能造成对有用信号增益的降低(受到抑制)或噪声提高,使接收机灵敏度下降,这种干扰称为( )干扰. A. 同频道 B. 邻道 C. 杂散辐射 D. 阻塞
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