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第1题

（ ）.微分方程y＇=e²χ-y满足初始条件y(0)=0 A.y=1n(1-e²χ)-1n2 B.y=1n(1-e²χ)+1n2 C.y=1n(1+e²χ)-1n2 D.y=1n(1+e&
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第2题

New Material Can Cool Buildings Researchers at Stanford University have developed a new material that can move heat o
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第3题

Children often dream of ________ they want to become when they grow up． 选择一项： A. what what B. that
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第4题

If you don’t want to go, I will go _____ you. 选择一项： A. instead B. instead of C. of instead
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