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【单选题】
检查时,加入适量的过硫酸铵固体的目的是( )A.
消除干扰
B.
加速Fe3+和SCN-的反应速度
C.
增加颜色深度
D.
将低价态铁离子(Fe2+)氧化为高价态铁离子(Fe3+),同时防止硫氰酸铁在光线作用下发生还原或分解反应而褪色
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皮皮学刷刷变学霸
举一反三
【简答题】A．correctly B．clearly C．fluently D．actually
【简答题】A．naturally B．truly C．really D．actually
【简答题】电子商务中的基础和核心是
【简答题】Mark Twain actually means ______.
【简答题】The legal document of patent is actually known as _______.
【简答题】Actually, the woman is undertaking a job as a ______.
【单选题】A scientist claims that for the conditions used to obtain the data for Figure4, the acceleration factor ofEnzymeB at a given concentration will always begreater than that of EnzymeA at the same concen...
A.
No; Enzyme B shows a lower acceleration factor at all the enzyme concentrations tested.
B.
No; Enzyme B shows a lower acceleration factor at all the substrate concentrations tested.
C.
Yes; Enzyme B shows a higher acceleration factor at all the enzyme concentrations tested.
D.
Yes; Enzyme B shows a higher acceleration factor at all the substrate concentrations tested.
【简答题】A．fluently B．efficiently C．exactly D．actually