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The author disagreed with Obama that______.A.the s.....
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易产生下肢静脉曲张的职业是A.重体力劳动,如搬运工B.音乐工.....
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According to the author, why did the firings in the Central Falls school arouse so much at..
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影响合金收缩的因素有化学成分、浇铸温度、铸件结构与铸型条件..
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PM2.5是指直径A、<2.5μm的颗粒物B、2.5μm<颗粒物<10μmC、2.....
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The word "disheartening" in Paragraph 7 has a sim.....
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