√70以上 ƒz[ƒ€ƒx[ƒXŒ^ ”¯Œ^ ƒƒ“ƒY ƒVƒ‡[ƒg 159551
V D= T(v, x – β) V ∆V M ∆M F ∆F bx∆x V by∆x ∆x ( m∆x M F Fx = Fy = Mc = FF ∆Fb ∆Fb x∆x = 0 ∆F b = 0 ∆x xVV ∆Vb ∆Vb y∆x = 0 ∆VH a f i f 4 b i f7 @ 2 a b c d 4 e e 8 3 f a a b g ; Vector Analysis By Alimkanwalimtinaa Issuu ƒz[ƒ€ƒx[ƒXŒ^ "¯Œ^ ƒƒ"ƒY ƒVƒ‡[ƒg