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轨道电路送电端测试的项目主要有：变压器(   )电压、变压器（    ）电压、（   ）电压、（     ）电压等。

【参考答案】

(1)
I次 (2)
II次 (3)
限流电阻 (4)
轨面

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设y=2x+sin2，则y&39;=______．
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阅读《大同》中的一段文字，并回答下列试题。
今大道既隐，天下为家，各亲其亲，各子其子，货力为己，大人世及以为礼，城郭沟池以为固，礼义以为纪。以正君臣，以笃父子，以睦兄弟，以和夫妇，以设制度，以立田里，以贤勇知，以功为己，故谋用是作，而兵由此起。禹、汤、文、武、成王、周公，由此其选也。此六君子者，未有不谨于礼者也。以著其义，以考其信，著有过，刑仁讲让，示民有常。如有不由此者，在势者去，众以为殃，是谓小康。
分析概括这段文字中所言小康社会的主要特点。
解释这段文字中加点字的含义。
隐：
作：
兵：
小康：
挑出这段文字的排比句，并分析其效果。
请帮忙给出每个问题的正确答案和分析，谢谢！
未知题型
Eleanor Roosevelt was the wife of America′s 32nd president, Franklin Roosevelt. She helped her husband in many ways during his long(21)lifE.She also became one of the most (22) women in AmericA.She fought for equal rights for all peoplE.
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选()
A.technical
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C.political
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选()A.different
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C.understand
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请帮忙给出每个问题的正确答案和分析，谢谢！
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