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【简答题】
半数有效量（ED50）：是能引起（）（质反应）或半数最大效应（量反应）的浓度或剂量，用半数有效浓度（EC50）表示。
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【单选题】The most important ingredient in any civilization is progress. So the media should focus on positive news.
A.
Y
B.
N
C.
NG
【单选题】K2Cr2O7溶液中存在平衡：Cr2O72-（橙色）+H2O CrO42-（黄色）+2H+。用K2Cr2O7溶液进行下列实验： 结合实验，下列说法不正确的是
A.
①中溶液橙色加深，③中溶液变黄
B.
②中Cr2O72-被C2H5OH还原
C.
对比②和④可知K2Cr2O7酸性溶液氧化性强
D.
若向④中加入70%H2SO4溶液至过量，溶液变为橙色
【简答题】William Shakespeare was a writer of plays and poems. Some of his most famous plays are Hamlet, Romeo and Juliet, Macbeth. He wrote thirty-seven plays in all. They are still popular today. He was born ...
【简答题】Willam Shakespeare was a writer of plays and poems. Some of his most famous plays are Hamlet, Romeo and Juliet, Macbeth .He wrote thirty-seven plays in all. They are still popular today. He was born i...
【简答题】阅读以下文章,然后回答后附的选择题,请把正确答案写在相应的题号的空格里。 The Nature of Business Business is the human activity related to material things. It is necessary for civilization. It is found in all societies, even the st...
【简答题】Reading the text and filling the blanks. 2 I think I got serious about this only recently when I ran into one of my former students, fresh from an excursion to Europe. “How was it?” I asked, full of e...
【简答题】利用Cr 2 O 7 2－ +H 2 O⇋2CrO 4 2－ +2H + 的K＝10 14 和Ag 2 CrO 4 的溶度积以及Ag + +e － ⇋Ag标准电极电势求2Ag 2 CrO 4 +2H + +4e － ⇋4Ag+Cr 2 O 7 2－ +H 2 O的标准电极电势。
【简答题】William Shakespeare was a writer of plays and poems. Some of his most famous plays are Hamlet, Romeo and Juliet, Macbeth. He wrote thirty-seven plays in all. They are still popular today. He was born ...
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