试题与答案

符号“⊥”在位置公差中表示()。 A.垂直度 B.同轴度 C.平行度 D.对称度

题型:单项选择题

题目:

符号“⊥”在位置公差中表示()。

A.垂直度

B.同轴度

C.平行度

D.对称度

答案:

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题型:单项选择题

  核电站的一次性投资确实比火电站大一些。衡量电站的经济价值,还要核算电站运行后消耗的燃料、设备折旧、运行管理等费用。30年来,国际上对煤电成本与核电成本所作的等值比较,显示出修火电站实际出现的低投入经济效应的负走向,修建核电站则正相反。目前,已有几十个国家建成300余座核电站,总功率达2亿千瓦左右,绝大多数核电站已使核电成本降至煤电的60%左右。现代经济价值观取得了又一次胜利。

  至于核电站所出现的事故,不足以否定其安全性。从核反应形式看,原子弹可以和核电站类比,但原子弹所用的铀-225浓度在弹体中高达90%,因此造成核链式反应的不可控性;而核电站采用的燃料是浓度低于4%的铀-235,这样反应效应就与原子弹有有根本的区别。从实际情况看,任何形式的电站,只要设计、管理出了问题,都可能导致事故发生。1979年印度一座大坝水电站爆炸竟使1.5万人丧生,当然这不是说切尔诺贝利核电站核物质外泄夺走了人的生命就值得庆幸。值得庆幸的是核电站系统工程技术有了新突破,核电站安全保险系数优于火电站。说到环境保护,最先进的火电站也难以让人作乐观的承诺,而核电站则别具优势。

根据题意,准确概括核电站特点的一组是()。

①高投入高质量低消耗

②经济价值高于火电站

③使用寿命高于火电站

④每度核电成本仅仅相当煤电的60%左右

⑤安全性强有利于保护环境

A.①③

B.②③⑤

C.②⑤

D.①④

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