单项选择题

创业会伴随着新价值的产生，这种价值就是经济价值

A．对
B．错

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In the experiment of determination of Fe2+ content by 1,10-phenanthroline spectrophotometry, what should be done if the measured iron content in sample exceeds the range of the calibration curve?
A、Extend the calibration curve
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C、Decrease the dilution factor of the test sample
D、Reduce the points for plotting the calibration curve

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肾的主要生理机能是
A、主血脉
B、主运化
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