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【单选题】
材料的体积密度为(P)与密实度(D)的关系是()A.
D+P>1
B.
D+P<1
C.
D+P=1
D.
D+P≠1
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【简答题】阅读理解。 There are many kinds of cars in this world. My grandfather thinks this is because cars are like their drivers. He says, ' Rich people have expensive cars, big people have large cars, a...
【单选题】重症肌无力患者的骨骼肌对运动神经冲动的反应降低是由于
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B.
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C.
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D.
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E.
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