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问题 单项选择题 B型题

巨幼细胞性贫血（）

A.红细胞中央淡染区扩大明显

B.NAP积分明显增高

C.骨髓红系细胞增生伴巨幼变

D.网织红细胞增高，>15%

E.骨髓穿刺常常"干抽"

答案

参考答案：C

单项选择题

Passage One

What was the major change in agriculture during the 19th century a. Crop production became increasingly specialized. b. Economic depressions lowered the prices of farm produce. c. New banking laws made it easy to buy farmland. d. The United States increased its agricultural imports.
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名词解释

矿物的比重
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