题目内容

We can obviously notice that over a period of no practice, what has been learned tends to be forgotten from________________________.

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The biggest barrier to sounding the alarm about bird flu is that people usually take flu seriously.

硫代硫酸盐

A. 先用硝酸或溴水氧化
B. 先加酸性氯化亚锑还原
C. 改用白田道夫法
D. 先加氰化钾掩蔽
E. 先加草酸生成沉淀

你认为在气相色谱分析中，两混合组分怎样才算达到完全分离？

请画出原子吸收分光光度计的结构框图，并说明各部件的作用。