英语翻译wherein R2,R3,R4,are each independently selected from th

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英语翻译
wherein R2,R3,R4,are each independently selected from the group consisting of hydrogen,methyl,CO.sub.2 Et,CH.sub.2 OH,(CH.sub.2).sub.3 OH.,and linear or branched alkyl,substituted or unsubstituted alkoxy alkyl,

R2,R3,R4,可以独立地选择以下基团：-H,-CH3,-CO(Et)2,-CH(OH)2,-C(OH)3,直连或支链烷烃,取代或非取代烷氧基烷烃

一共R1,R2,R3,R4,R5五个电阻,R1串联于R3,R4,R3与R4并联,R2并联于R1,R3,R4,R5在干路上那个电阻的什么定律R1/R2=R3/R4 某家庭电路,一个电热器,现有4个电阻,R1,R2,R3,R4(R1 戴维南定律,开路电压Uoc怎么算?等效电阻是不是(R1//R3)+(R2//R4)? the players selected from the whole country are expected to 电阻R1、R2、R3串联,与R4并联；R1与R2的电流是1.8A,R2与R3的电流是1.6A,R2=R4,求：总电流是多如图所示,四个电阻R1,R2,R3,R4串联.已知R2=R4,Uac=150v,Ubd=70v,求A,E两点之间的电压U 电源电阻值的计算?R1与R4串联R2与R5串联(R1R2)、(R4R5)、电源三者并联.R3联接于R1与R4、R2与R5 英语翻译Twenty trees wererandomly selected from 30 trees for whi 英语翻译Selected results from control valve re-engineering proje 英语翻译read the following sentence selected from passageA,payin 有四个电阻分别为R1,R2,R3,R4电阻分别为4欧,2欧,2欧和402欧,R1和R2串联,R2又和R3串联,然后和R4