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问题 填空题

光线经过两种不同介质的交界面时，就会发生偏折现象，这种现象称为光的（）

答案

参考答案：折射

单项选择题

C


Americans use more water than any other people in the world. If we continue to use water at the rate we do now, we will soon not have enough to meet our needs. In 1980, 40 billion gallons were used each day in the United States. In 1990, 700 billion gallons were used. The average Americans use almost 90 gallons of water a day for personal use. And much move water is needed to make the things American people like to have. For example, it takes thousands of gallons of water to make one pound of beef for the dinner table. It takes more than 100000 gallons of water to make a car. If we include these uses of water, the average American uses about 2000 gallons of water a day．

What is the author’s opinion ( )

A．Americans don’t have enough water.

B．Americans don’t use enough water.

C．Americans like to use water.

D．Americans use too much water.
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多项选择题 案例分析题

患者男，45岁，因跌伤致左下肢髌骨骨折入院，拟择期在蛛网膜下腔阻滞下行切开复位内固定术。既往体健，心肺无特殊，无手术外伤史，无药物过敏史。查体：一般情况好，T：36.7℃，P：90次／分，R：20次／分，BP：18／12kPa（140／90mmHg），体重64kg。

提示：蛛网膜下腔用药后30分钟，患者出现恶心呕吐，面色苍白，躁动不安，测血压10／6.5kPa（75／50mmHg），HR：58次／分。对上述情况应作哪些处理（）

A.先快速输液200-300ml

B.麻黄碱30mg，半量静脉注射，半量肌肉注射

C.皮下注射肾上腺素1mg

D.立即静滴多巴胺

E.静脉注射阿托品0.25-0.3mg

F.度冷丁－异丙嗪合剂

G.头高足低位

H.面罩吸氧
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