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/etc/nginx/nginx.conf.第四题,求解答,谢谢&
答案选: B若φ=π,则f(x)=Acos(ωx+π)⇒f(x)=-Acos(ωx)(A>0,ω>0,x∈R)是偶函数;若f(x)是偶函数,⇒f(0)=1,∴f(0)=Acos(ω×0+φ)=Acosφ=1.∴φ=kπ+π,k∈Z,不一定有φ=π“f(x)是偶函数”是“φ=”必要不充分条件.故选B.希望能帮到你, 望采纳. 祝学习进步
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ATGCU,包括噬菌体是DNA病毒,所以,核苷酸也是由这几个碱基组成的:脱氧核糖核酸ATGC4种。HIV是RNA病毒,碱基是有5种,核酸中有4种碱基,核酸就有8种了,分别是ATGC,核糖核酸AUGC4种,碱基是AUGC四种,核苷酸也是4种就是ATGC组成核苷酸。烟草是一种植物,也是4种,里面既有DNA也有RNA,核酸只是核酸核酸}