单选题:For some people,it may be better——.

题目内容:
For some people,it may be better——. A.to wear a seat belt for health reasons
B.]not to wear a seat belt for health reasons
C.to get a valid medical certificate before wearing a seat belt
D.to pay a fine rather than wear a seat belt
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答案解析:

求曲线y=lnx在区间(2,6)内的一条切线,使得该切线与直线x=2,x=6及曲线y=lnx所围成的图形的面积最小.

求曲线y=lnx在区间(2,6)内的一条切线,使得该切线与直线x=2,x=6及曲线y=lnx所围成的图形的面积最小.

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患者,女,72岁。COPD病史l0年。入冬后受凉感冒急性发作人院。患者痰多黏稠,不易咳出,今晨翻身时突然出现面色发绀,烦

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