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What a fine day today! 小题1:____________________ ?
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If our parents do everything for us children, we won't learn to depend on _____. [ ]
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自然数a、b(b≠0),如果a=7b,a和b的最大公因数是______,最小公倍数是______.
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________,I have never seen anyone who's as capable as John.
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电源内阻忽略不计.闭合电键,电压表示数为U,电流表示数为I;在滑动变阻器R1的滑片P由a端滑到b端的过程中( )
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