用碘量法测定水中总氯时,若水样中含()、()和锰,将产生正干扰。

用碘量法测定水中总氯时,若水样中含()、()和锰,将产生正干扰。

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- ID card, please.- _________A. Here is it. B. Here are they C. Here you are D

- ID card, please.- _________A. Here is it. B. Here are they C. Here you are D

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- George told me he could not come here because his mother was ill.- _________

- George told me he could not come here because his mother was ill.- _________

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[交际用语]- Excuse me, when does the next flight from Paris arrive? - _________A I

[交际用语]- Excuse me, when does the next flight from Paris arrive? - _________A I

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