——————————_DNARNA
组成单位:脱氧核苷酸,核糖核苷酸
碱基:A、T、G、C A、U、G、C
五碳糖: 脱氧核糖核糖
空间结构: 双螺旋 一般是单链
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- 4先化简,再求值∶(1/x-y-1/x+y)÷2y/x²+2xy+y²,其中x=根号下3加根号下2,y=根号下3-
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