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The number of books in the bookshop ________ (be) about 10,000 and most of them are about science.
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1年前
已知实数a、b满足(a2+b2)2-2(a2+b2)=8,则a2+b2的值为---------( )
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—How do you feel today, Ted? —I feel____ better today, thank you.
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现有A,B,C,D,E,F,G七种物质,C和F是最常见的金属,B是气体单质,D为浅绿色溶液,G为蓝色溶液,它们之间存在如下关系:
1年前