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src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002Fd733a10e667d402bd6375b5d225f5f72.png\">处连续的定义是()",{"answer":42,"createTime":5,"id":43,"options":44,"question":49,"source":21,"type":22},[],365502344,[45,46,47,48],"充分不必要条件","必要不充分条件","充要条件","既不充分也不必要条件","二元函数的极限存在是其连续的()",{"answer":51,"createTime":5,"id":52,"options":53,"question":58,"source":21,"type":22},[],365502345,[54,55,56,57],"0","1","-1","2","函数\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F0b4802a99ae97de898f0c4b60b685cc7.png\">(\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F3779c53dfa0fa2efb2767e45647d5357.png\">)在\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F361f803fede7a7a065681a081d6e7596.png\">处补充定义\u003Cimg src=\"https:\u002F\u002Ftihai-oss-cloud.itihey.com\u002Fimg\u002F1aed8f73b00866b024fc698ad31189c2.png\">后连续,则\u003Cimg 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