题目内容

对显色反应的要求不包括

A. 选择性好
B. 有色物配位比必须是1∶1
C. 灵敏度高
D. 有色产物性质稳定

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在分光光度法中,浓度测量的相对误差较小(≤±2%)的透光率T范围是

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C. 0.2-0.8
D. 0.15-0.368

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B. to hear
C. having heard
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My father, as well as my mother, __________ delicious food for me whenever I go back home from the university.

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