将一正电荷从无限远处移至电场中M点，静电力做功W₁=6×10^-9 J，若将一个等量的负电荷从电场中N点移向无限远处，静电力做功W₂=7×10^-9 J，则M、N两点的电势φ_M、φ_N有如下关系[ ]

A.φ_M＜φ_N＜0

B.φ_N>φ_M>0

C.φ_N＜φ_M＜0

D.φ_M>φ_N>0

植物缺素症 hunger sign in plant, nutrient deficiency symptom in plant