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【单选题】
用含有少量 Ca 2+ 、 Mg 2+ 的纯水配制 EDTA 溶液,然后于 pH 5~6 时、以二甲酚橙为指示剂,用标准锌溶液标定 EDTA 的浓度;最后在 pH=10.0 时、以铬黑 T 为指示剂,用上述 EDTA 溶液滴定试样中 Mg 2+ ,对 Mg 2+ 的含量测定结果的影响是( )。A.
偏低
B.
无法确定
C.
偏高
D.
不影响
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举一反三
【单选题】What did Professor Morgan use to finish writing her paper?
A.
typewriter.
B.
A paper and pencil.
C.
computer
D.
pen
【简答题】What did Morgan discover about her
bookshelves? (5.0分)A. Most of the books she owned were the same
genre. B. Most of her books were by American or
British authors. C. Most of the books she owned were ...
【单选题】What did Morgan discover about her bookshelves?
A.
Most of the books she owned were the same genre.
B.
Most of her books were by American or British authors
C.
Most of the books she owned were set in England.
【单选题】What goal did Morgan set for herself?
A.
She would read one book from a different country every year.
B.
She would read a book from every country in a year.
C.
She would start to translate books from other countries.
【简答题】What goal did Morgan set for herself? (5.0分)A. She would read one book from a different
country every year. B. She would start to translate books from
other countries. C. She
would read a book from ev...
【简答题】从A.B.C.D中找出并能替换划线部分的选项 小题1:Mum has a bad headache. We have to send for the doctor at once. A．ask the doctor to come B．find the doctor by ourselves C．send the doctor away D．go to the doctor's 小题2:I hav...
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