问题
单项选择题
在冠心病病人非心脏手术麻醉管理中，下列措施对增加心肌氧供无效的是（）
A．增加主动脉舒张压
B．给予硝酸酯类扩张冠状动脉
C．过度通气
D．提高血红蛋白浓度
E．提高吸入氧浓度
答案
参考答案：C
解析：过度通气表面上是增加了通气量，似乎可以增加机体的氧供，但由于过度通气造成呼吸性碱中毒则可诱发冠状动脉痉挛，反而减少心肌血流，适得其反。
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在冠心病病人非心脏手术麻醉管理中，下列措施对增加心肌氧供无效的是（）
A．增加主动脉舒张压
B．给予硝酸酯类扩张冠状动脉
C．过度通气
D．提高血红蛋白浓度
E．提高吸入氧浓度
参考答案：C
解析：过度通气表面上是增加了通气量，似乎可以增加机体的氧供，但由于过度通气造成呼吸性碱中毒则可诱发冠状动脉痉挛，反而减少心肌血流，适得其反。
Bill Gates __36___ on October 28, 1955. He grew up in Seattle, Washington. He was a very ___37___ boy. His favorite subjects at school were science and maths. ___38___ he was 13 years old, Bill started to play with computers. At that time, computers ___39___ very large machines. Once(一度) he was very interested __40___ a very old computer. He and some of his friends __41____ lots of time doing unusual things with it. In the end, they worked .out a software program (软件程) with the old machine. Bill ___42__ it for $ 4200 when he was only 17. In 1973, Bill ___43___ Harvard University(哈弗大学). In his third year, he left Harvard to work for a company(公司) called Microsoft. Bill began his company in 1975 __44____ his friend Paul Allen. They thought the computer would come into every office and every home soon. So they began developing( 开发)the software for personal（个人的） computers: They improved (改进)the software to __45____ it easier for people to use computers.
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