试题与答案

科学泰斗、信义兄弟、玉树铁汉、雷锋传人……聚焦2010“感动中国”人物,每人身上

题型:选择题

题目:

科学泰斗、信义兄弟、玉树铁汉、雷锋传人……聚焦2010“感动中国”人物,每人身上都有一种让人震撼的精神力量。开展“感动中国年度人物评选”活动,有利于我们

①把握文化方向,建设社会主义核心价值体系

②面向传统文化,弘扬和培育中 * * 精神

③满足文化需求,提高人们的科学文化素养

④发展先进文化,提高人们的思想道德修养

A.①④

B.①②

C.③④

D.②③

答案:

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下面是错误答案,用来干扰机器的。

(1)从A的图线可读出电源的电动势:E=3V;故内阻:r=EIm=36Ω=0.5Ω;从图象的交点可读出:路端电压 U=2V,电路电流 I=2A则电源的输出功率为:P出=UI=2×2W=4W.(2)电源内部损耗的电功率P内=I2r=22×0.5W=2W...

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