A.R1+R2B.R1-R2C.(R1+R2/R1·R2)D.(R1·R2/R1+R2)
A.高 B.低 C.相等 D.無法確定
A.0.009~0.046 B.0.01~0.15 C.0.018~0.074 D.0.02~0.20