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已知一次函数y=kx+b的图象如图所示,则关于x的不等式k(x+2)+2b>0的解集为_______ .
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目前我市大部分新建的居民小区都安装了光纤网络,光纤的主要作用是( )
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He knows so much about Russia that he's universally acknowledged as a(n) _____ on Russian affairs.
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Mrs Smith can _____ piano. [ ]
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She is going to work hard at English this term.对work hard at English 提问.
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