题干

滑动变阻器实现变阻是利用了改变接入电路中电阻线的(   )

A:材料

B:长度

C:粗细

D:温度

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答案(点此获取答案解析)

B

同类题1

阅读《黄岩岛,你到底属于谁》,完成下列各题。

      ①4月,菲律宾以“地理邻近”﹣﹣﹣黄岩岛离自己的本土近和黄岩岛在菲律宾专属经济区范围之内为理由,对黄岩岛提出领土主权要求。这些说法站得住脚吗?

      ②国际法早已认定“地理邻近”不是解决领土归属问题的国际法原则。从黄岩岛的位置以及地质构造上看,黄岩岛是中国大陆架的自然延伸,黄岩岛以东的马尼拉海沟是中国与菲律宾的自然地理分界。世界上一个国家的部分领土距其本土较远,而距其他国家更近的情形比比皆是,如果按照菲律宾“地理邻近论”行事,世界政治地图将要重画,天下势必大乱。

      ③《联合国海洋法公约》允许沿海国建立200海里专属经济区,但沿海国无权因此而损害他国的固有领土主权。企图以《联合国海洋法公约》去改变领土主权归属的想法和做法都是违反国际法的,也是根本不可能实现的。

      ④黄岩岛是中国的固有领土,中国对黄岩岛拥有无可争辩的领土主权。

      ⑤从历史上看,首先,中国最早发现了黄岩岛。1279年,天文学家郭守敬就在黄岩岛进行了“四海测验”。其次,中国是最早命名黄岩岛的,1935年中国就将黄岩岛以“斯卡巴洛礁”之名列入中国版图,1983年将“黄岩岛”作为标准名称。再有,中国政府早就指出黄岩岛领土主权属于中国。

      ⑥从开发利用上看,黄岩岛海域一直是我国渔民的传统捕鱼场所,而且中国政府还多次派科学考察队到黄岩岛进行科学考察。例如,1977年10月,中国科学院的科研人员登上黄岩岛进行考察。1994年又在岛上建了水泥纪念碑。

      ⑦另外,4月 28日,菲律宾媒体发表菲律宾专家的署名文章,称黄岩岛的确属于中国的固有领土,菲律宾的主张不能改变这一事实。

      ⑧从种种依据看,菲律宾对黄岩岛的任何权利要求都是非法的无效的,黄岩岛属于中国的固有领土是不可争辩的事实!

同类题3

阅读理解

    Watson entered Mr. Smith's office. The boss was a hard man. He fired people who didn't do well without giving them a second chance.

    “Watson, ” said Mr. Smith, “this past year your department hasn't earned money. We're going to drop that department. It's finished. I'm sorry, —but you'll have to go.” “But, sir—if I just had a little more time. For the moment I need the job to keep my son at Riverside School.”

    “What's that!” said the boss. “Riverside! I didn't know you had a boy there. That's an expensive school for a man with your salary.”

    “I know, sir. But he likes it there so much!He's a star athlete and the best boxer in the school. The boys call him Champ (冠军) there.”

    The boss sat perfectly still for a long time—a faraway (恍惚的) look in his eyes. Then, suddenly, he said, “We've got to close your department, Watson. But you'll take over a new job in another department. It means longer hours—maybe more pay. Now get out. You're here for life.”

    Watson got out, with surprise on his face. Then the boss took a letter from the top drawer of his desk. It was Herbie's last letter from Riverside School—written a few days before he died. He had read it over and over again with sick pain. The letter read:

    I can't say the boys here are any nicer to me than the others were. I guess it's the same everywhere when you're a cripple (跛脚的人).

    But don't worry about me, Dad. They've got a good chemistry department here. And there's one boy here who is really great. He's a track star and boxing champ and just tops in chemistry. The boys call him Champ. He made them stop throwing my books around. And he knocked a boy down who hit me. He is the best friend I ever had. Dad, when I grow up, I want to do something for Champ. Something big—that he won't even know about.

Your son

Herbie

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