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患儿．3个月。查体见口唇及睑结膜稍苍白，红细胞3.0×10/L，血红蛋白110g／L，该患儿可能是

A.生理性贫血
B.营养性缺铁性贫血
C.营养性巨幼红细胞性贫血
D.营养性混合性贫血
E.再生障碍性贫血
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相关考题

单项选择题
法洛四联症的主要临床特点不包括
A.肺动脉狭窄
B.室间隔缺损
C.主动脉骑跨
D.房间隔缺损
E.右心室肥厚
未知题型
The Pony Express
In the United States today, we can send a letter from coast to coast in just a few days for well under half dollar. But news did not always travel as fast or as cheaply as it does today. In the mid 180Os, trains and horse-drawn coaches carried mail. It took many weeks for news to travel from New York to CaliforniA.
In 1860, the railroad and telegraph reached only from the East Coast to Missouri, less than halfway across the country. Horse-drawn coaches, which were very slow, then carried the mall from Missouri to CaliforniA.In April 1860, the Pony
Express began to carry the mail from St. Joseph, Missouri, to Sacramento, CaliforniA.The trip took just ten days——half the time the coaches took.
The Pony Express was a home relay system. There were stations every 10 or 15 miles along the route, which was nearly 3,200 kilometers (2,000 miles) long. Fresh homes were at each station. The riders, with their heavy mailbags, changed homes at every station. They continued riding full speed for a total of about 100 miles. Then another rider took over and continued riding.
The Pony Express riders rode through dangerous territory, including mountains., deserts, and Indian lands. Bad weather didn't stop these tough riders, either. They rode through rain, snow, sleet, and blizzards, both night and day. The riders, therefore, had to be both brave and strong. Some newspapers in 1860 carried this advertisement:
Wanted: Young, skinny, wiry fellows, not over 18. Must be expert riders, willing to risk death daily. Orphans preferreD.
Most of the young Pony Express riders completed the ride successfully. Some of them even became famous for their courage and bravery during difficult rides. What did these young men get paid for their bravery? Twenty-five dollars a week. And what was the cost of sending a letter by Pony Express? Five dollars a half-ounce in 1860, then reduced to two dollars in 1861.
In October 1861, the telegraph reached CaliforniA.The Pony Express disappeared after this and became a short but exciting chapter in American history.
What is the usage of the Pony Express?
A.To help people travel from coast to coast.
B.To train ridem for competition.
C.To transfer materials and messages.
D.To arrest criminals in the West.
单项选择题
小儿肺炎时，室内最适宜的温湿度是
A.18～20℃，60％
B.20～22℃，70％以上
C.22～24℃，40％
D.22～24℃，30％
E.18～20℃，50％
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