题目内容

空白试验主要是减免

A. 试剂误差
B. 仪器误差
C. 方法误差
D. 操作误差

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下列措施为减小偶然误差的是

A. 多次测定取平均值
B. 回收试验
C. 对照试验
D. 空白试验

In consideration of the beauty of poems, 1concludes that “the death of a beautiful woman is unquestionably the most poetical topic in the world”.

1is regarded as the father of psychoanalytic criticism and the detective story.

1’s poems have the musical quality and romantic beauty. The Raven is his best-known poem.