题目内容

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

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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.

可分泌胃酸的主要细胞是

A. 肥大细胞
B. 壁细胞
C. 黏液细胞
D. 杯状细胞
E. 主细胞