题干

为了精确则量某待测电阻 Rx 的阻值( 60Ω )。有以下器材可供选择。
电流表: A1 ,(量程 050mA ,内阻约 6Ω
电流表: A2 (量程 03A ,内阻约 0.6Ω
电压表: V1 (量程 03V ,内阻约 3000Ω
电压表: V2 (量程 015V ,内阻很大)
滑动变阻器: R105Ω ,允许最大电流 2.0A
滑动变阻器: R201KΩ ,允许最大电流 0.5A
电源: E (电动势约为 3V ,内阻约为 0.2Ω
单刀单掷开关 S 一个,导线若干;
①电流表应选____电压表应选____,滑动变阻器应选____。(填字母代号)
②请在方框中两出测量电阻 Rx 的实验电路图____。(要求测量值的范围尽可能大一些)
③通过分析,在本实验中 Rx 的测量值____真实值(填“大于”“相等”或“小于“)。
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答案(点此获取答案解析)

A1,V1,

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阅读下列短文,从下面每小题的A、B、C、D四个选项中选出最佳选项

    Hershey chocolate is famous around the world. The man who began it, Milton Hershey, was glad to share the fruits of success with others.

    Milton Hershey was born on 13 September, 1857. In 1871, he started working for a local printer. But he didn't like this kind of work and ended the job quickly. Later, he helped make candy in a factory. After a few years, Milton knew that he was a good candy maker and he wanted to start his own candy business. In 1886, he started a caramel (焦糖) business, and four years later his business was very successful. After seeing how chocolate was made. Milton loved it right away. He got married and sold the caramel company for one million dollars and opened up a chocolate factory.

    Milton built a town with houses, schools, and stores so the workers in his factory could live nearby. As Milton made more money, he built a school for orphans (孤儿). When his wife died, Milton took all of his money and gave it to the school to help those children. He also set up the M. S. Hershey Foundation to help people get an education.

    Milton Hershey died in 1945, but the world remembers him for not only making chocolate, but for his work to help people. He is someone who built a town and helped people get jobs. He is someone who built a school for children who did not have families. He is someone who helped those who were sick and someone who made that chocolate, that delicious chocolate which most of us throughout me world enjoy.