药物与含量测定法
维生素C
A．气相色谱法B．高效液相色谱法C．紫外分光光度法D．碘量法E．非水滴定法
参考答案：D
读一读，写一写。
It's six o'clock in the evening now. My mother is making supper. My father is reading the newspaper.
My little sister is watching TV. I am doing my homework. What is your family doing now? Please try to write.
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用于分类记录单位的全部交易或事项，提供总括核算资料的账簿是( )。
A．总分类账
B．明细分类账
C．日记账
D．备查账
