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问题 填空题

一个阻值为50Ω的电阻通以4A的电流，在10s的时间内所产生的热量为______J．

答案

电流产生的热量为Q=I2Rt=（4A）2×50Ω×10s=8000J．

故答案为：8000．

单项选择题 B型题

颈、胸部手术后，在病情许可情况下，体位应为（）

A.平卧、头转向一侧

B.15°～30°头高脚低斜坡卧位

C.高半坐位卧式

D.低半坐位卧式

E.下肢抬高15°～20°，头部和躯干抬高20°～30°的特殊体位
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单项选择题

W: Carol told us on the phone not to worry about her. Her left leg doesn’t hurt as much as it did yesterday.
M: She’d better have it examined by a doctor anyway. And I will call her about it this evening.
Q: What does the man think Carol should do().

A. See a doctor.

B. Stay in bed for a few days.

C. Get treatment in a better hospital.

D. Make a phone call to the doctor.
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