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There will be a high-speed railway     (connect) Yangzhou to Nanjing.

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R串>R2>R1>R.并   R并>R.串>R2>R1   R串>R.并>R1>R2   R串>R.并>R2>R1  
R=R1+R2  R=R1+R2+R3  R=R1+R2+R3+R4  R=R1+R2+R3+R4+R5  
R=R1+R2  R=R1×R2/(R1+R2)  R=R1+R2/R1×R2  
1/R=(1/R1)+(1/R2)+(1/R3)  R=R1+R2+R3  R=1/(R1R2R3)  R=R1=R2=R3  
当R₁R₃=R₂R₄时,电桥平衡  当R₁R₃=R₂R₄时电桥不平衡  当R₁R₂=R₃R₄时,电桥平衡  当R₁R₂=R₃R₄时,电桥不平衡  
R1-R2  R1+R2  (R1+R2)/R1×R2  R1×R2/(R1+R2)  
1/R=1/R1+1/R2+1/R3  1/R=1/R1+R2+R3  R=R1+R2+R3  1/R=1/R1R2R3  
R=R1+R2+R3  R=R1=R2=R3  1/R=1/R1+1/R2+1/R3  R+R1=R2+R3  
R=R1=R2=R3  R=R1+R2+R3  1/R=1/R1+1/R2+1/R3  R=R1R2R3  
R1+R2  R1·R2  R1·R2/(R1+R2)  R1+R2/R1·R2  (R1+R2)/R1·R2  
1/R=1/R1+1/R2+1/R3  1/R=1/R1+R2+R3  R=R1+R2+R3  R=R1R2R3  
R=R1+R2+R3  R=R1=R2=R3  1/R=1/R1+1/R2+1/R3  R+R1=R2+R3  
1/R=1/R1+1/R2+1/R3  1/R=1/R1+R2+R3  R=R1+R2+R3  1/R=1/R1R2R3  
1/R=1/R1+1/R2+1/R3  1/R=1/R1+R2+R3  R=R1+R2+R3  R=R1R2R3  

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