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【多选题】
你认为下列哪些推断或结论可能是正确的
A.
在 pH 较低，如 pH=1 ，由于 EDTA 的酸效应比较严重，可能会使得 M+Y 的反应进行的很不完全
B.
在 pH 较高，如 pH=12 ，由于金属离子的水解效应比较严重，可能会使得 M+Y 的反应进行的很不完全
C.
假设用 Y 滴定 M ，以确定 M 的浓度，要求 M+Y 反应完全，因此，一般情况下不太可能在太酸或太碱性的溶液中进行滴定（也许有例外，但现在看来是这样的）
D.
配位效应的大小，与第二种络合剂的浓度是有。比如用 EDTA 滴定 Zn 2+ （先不管这种假设情况下的滴定是否可行），如果溶液中存在 NH 3 ，可能会对滴定反应造成严重干扰。
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【单选题】听力原文：M: How many literature courses have you taken at the University? W: I've only had one course each in American and British Literature. I wish I had had more, especially in other languages. Q: What...
A.
Universities.
B.
British and American English.
C.
Language courses.
D.
Literature courses.
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【判断题】在安全色标中用绿色表示安全、通过、允许、工作。
A.
正确
B.
错误
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【判断题】萃取是利用溶质在互不相溶的两相之间分配系数的不同而使溶质得到纯化或浓缩的单元操作( )
A.
正确
B.
错误
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【单选题】听力原文：M: Hi, Helen, what do you think of our class in Children's Literature? W: It looks pretty good. Are you also majoring in Elementary Education? M: Yes. I can use this to fulfill the requirement fo...
A.
Children's Literature.
B.
American Literature.
C.
Medicine.
D.
Elementary Education.
查看完整题目与答案
【单选题】听力原文：M: You really seem to enjoy your literature class. W: I sure do. It's opened new worlds for me. I'm exposed to the thoughts of some of the world's best writers, I've never read so much in my life...
A.
She' s going to earn more money.
B.
She is writing a book on literature.
C.
She has met some interesting students.
D.
She is enjoying reading good books.
查看完整题目与答案
【单选题】听力原文：M: Hi, Helen, what do you think of our class in Children's Literature? W: It looks pretty good. Are you also majoring in Elementary Education? M: Yes. I can use this to fulfill the requirement fo...
A.
Children' s Literature.
B.
American Literature.
C.
Medicine.
D.
Elementary Education.
查看完整题目与答案
【简答题】( )是利用溶质在互不相溶的两相之间分配系数的不同而使溶质得到纯化或浓缩的技术。
查看完整题目与答案
【判断题】在安全色标中用绿色表示安全、通过、允许、工作
A.
正确
B.
错误
查看完整题目与答案
【单选题】Books, even in this age of cheap literature, cost money? The shortage of paper, together with the high cost of living, has made books an expensive item in our list of requirements. This would mean tha...
A.
give less consideration to books than food
B.
can hardly afford time to read books
C.
know nothing about the value of education
D.
should have spent more money on daily needs
查看完整题目与答案
【判断题】在安全色表中用绿色表示安全、通过、允许、工作。(0分)
A.
正确
B.
错误
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相关题目：
【单选题】听力原文：M: How many literature courses have you taken at the University? W: I've only had one course each in American and British Literature. I wish I had had more, especially in other languages. Q: What...
A.
Universities.
B.
British and American English.
C.
Language courses.
D.
Literature courses.
查看完整题目与答案
【判断题】在安全色标中用绿色表示安全、通过、允许、工作。
A.
正确
B.
错误
查看完整题目与答案
【判断题】萃取是利用溶质在互不相溶的两相之间分配系数的不同而使溶质得到纯化或浓缩的单元操作( )
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：M: Hi, Helen, what do you think of our class in Children's Literature? W: It looks pretty good. Are you also majoring in Elementary Education? M: Yes. I can use this to fulfill the requirement fo...
A.
Children's Literature.
B.
American Literature.
C.
Medicine.
D.
Elementary Education.
查看完整题目与答案
【单选题】听力原文：M: You really seem to enjoy your literature class. W: I sure do. It's opened new worlds for me. I'm exposed to the thoughts of some of the world's best writers, I've never read so much in my life...
A.
She' s going to earn more money.
B.
She is writing a book on literature.
C.
She has met some interesting students.
D.
She is enjoying reading good books.
查看完整题目与答案
【单选题】听力原文：M: Hi, Helen, what do you think of our class in Children's Literature? W: It looks pretty good. Are you also majoring in Elementary Education? M: Yes. I can use this to fulfill the requirement fo...
A.
Children' s Literature.
B.
American Literature.
C.
Medicine.
D.
Elementary Education.
查看完整题目与答案
【简答题】( )是利用溶质在互不相溶的两相之间分配系数的不同而使溶质得到纯化或浓缩的技术。
查看完整题目与答案
【判断题】在安全色标中用绿色表示安全、通过、允许、工作
A.
正确
B.
错误
查看完整题目与答案
【单选题】Books, even in this age of cheap literature, cost money? The shortage of paper, together with the high cost of living, has made books an expensive item in our list of requirements. This would mean tha...
A.
give less consideration to books than food
B.
can hardly afford time to read books
C.
know nothing about the value of education
D.
should have spent more money on daily needs
查看完整题目与答案
【判断题】在安全色表中用绿色表示安全、通过、允许、工作。(0分)
A.
正确
B.
错误
查看完整题目与答案