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鸡冠有两种性状—-玫瑰冠和单冠。若亲代个体都为玫瑰冠,后代个体中有玫瑰冠和单冠(R表示显性基因,r表示隐性基因)。则下列推断正确的是( )
函数f(x)=log0.5(x2-2x+3)的单调递减区间是( )
下列细胞结构,植物细胞有而动物细胞没有的是( )
找出下列词语的反义词。
开始—____ 离去—____