Section A Environmental Protection Throughout the World Section B Green Spaces in Cities Section C Earth--aLiving Planet

高等数学第六章习题 1.设曲线y=a(4-x2)(a>0)过此曲线和x轴交点(-2,0)及(2,0)作曲线的两条法线,求曲线与这两条法线所围成的平面图形的面积最小时a的值 2.算曲线4y2=x与直线y+x=所围成图形的面积 3.算曲线y2=2px及其在点(,p)处的法线所围成的图形的面积 4.计算抛物线y=-x2+4x-3及其在点(0-3)和(3,0)处的切线所围成图形的面积

Section A Looking to the 21st Century Section B Trends for the 21st Century Section C Lifestyles of the 21st century

Section A Stop Brain Drain Section B Borderline Ridiculousness Section C We Share the Same Heritage

Section A Birth of bright Ideas Section B Ways of Increasing Creativity Section C Great Ideas

1 在 时刻， 与 两处质点速度之比是 (A) 1 (B) -1 (C) 3 (D) 1/3 1 一平面简谐波的波动方程为

Section A As His Name Is, So Is He! Section B Judge by Appearances Section C The pain in Wearing High Heels

Section A Weeping for My Smoking Daughter Section B Stop Spoiling your Daughter Section C What Is in Larry's Mind?

目标规划 一、某工厂计划生产A、B两种产品,每吨产品的耗电量指标、原材料消 耗、单位产品利润及资源限量如表所示。 二、厂长首先考虑要充分利用供电部门分配的电量限额66, 然后考虑利润不低于100元; 三、据市场调查结果,希望B产品的产量不低于A产品的产量, 问应如何制定产品A、B的产量

Section A Reports on Britain Under the Bombs Section B Forty-Three Seconds over Hiroshima Section C Narrow Escape