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【单选题】
用含有少量 Ca 2+ 、 Mg 2+ 离子的蒸馏水配制 EDTA 溶液,然后于 pH5.5 以二甲酚橙为指示剂,用标准锌溶液标定 EDTA 溶液的浓度,最后在 pH10.0 用上述 EDTA 溶液滴定试样中 Ni 2+ 的含量,问对测定结果的影响是:A.
偏高
B.
偏低
C.
无影响
D.
时低
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举一反三
【单选题】She does not have a real friend because she always treats people whit an air of .
A.
arrogance
B.
fragrance
C.
returned
D.
appetizer
【单选题】She does not have a real friend because she always treats people with an air of__________.
A.
arrogance
B.
fragrance
C.
returned
D.
appetizer
【简答题】Why does the woman ask about the time? [A] She does not have a watch. [B] She is nervous about the appointment. [C] Tom's watch keeps good time. [D] Tom is afraid to be late.
【单选题】Why does the woman ask about the time?
A.
She does not have a watch.
B.
She is nervous about the appointment.
C.
Toms watch keeps good time.
D.
Tom is afraid to be late.
【单选题】A nurse is not qualified if she does not have patience and show concern for her patients.
A.
Right
B.
Wrong
C.
Not mentioned
【简答题】A．the volunteers do B．because she does not have a weight problem C．because the life there can be very boring D．make people overeat E．because she was her own boss F．after passing a high-protein test 第 ...
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