请教ContourPlot出不了图这是为什么，代码如下，图如下 - 数学建模社区-数学中国

k = 2*10^9; d = 10; M = 2.19*10^9; P = u: q" O M6 E- W$ q6 {0 e* o6 T. Z
2.19*10^9; t = 1; h = 0.025; q = 1000;
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w = 0.01; r = 0.1
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A = (3*M*P)/(M*P + 3*k*M + 3*k*P);* i! O; ~' q6 S1 o9 a
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B = (3*M)/(P + 3*k);8 J5 i0 c$ C9 n" I6 n3 }
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Q = (3*k*M + 3*k*P + 7*M*P)/(M*P + 3*k*M + 3*k*P);& L' z1 u9 ?, ?) i9 o/ J7 [% n
s = (7*M + 6*k)/(P + 3*k);$ a! ~. p2 Y, m/ H
a = E^((M*P*t + 3*k*M*t + 3*k*P*t)/(3*k*d + P*d))2 L, ]& r, v: d* p9 Z
G = (z - h)/Sqrt[(r^2 + z^2 - 2*h*z + h^2)] - (z - h)/( @/ ~# @( h/ g0 H
Sqrt[(r^2 + h^2 + 2*h*z + z^2)];
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H = (z^3 - h^3 - 3*z^2*h + 3*h^2*z)/Power[z^2 - 2*h*z + h^2 + r^2, (: u; v3 H! N" ~! O+ y
3)^-1];. R: q! e; J, _) a0 w4 g
U = (z^3 + 2*h*z^2 + z*h^2)/Power[z^2 + 2*h*z + h^2 + r^2, (3)^-1];
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J = (18*h^2*z^3 + 18*h^3*z^2 + 6*h^4*z + 6*h*z^4)/Power[# F. s5 a ?4 x& t4 W
z^2 + 2*h*z + h^2 + r^2, (5)^-1];5 a5 i, J5 C9 D: X5 H
M = 1 - h^3/Power[h^2 + w^2, (3)^-1];6 P! t; x! i& P! Z
L[r_, z_] = ; Y' Z/ Y3 D- \/ @8 v3 L
4*q*M*A*G - 4*q*M*a*G*A + 4*q*M*a*G*B + 4*q*M*H + 4*q*M*U*Q - & x9 M1 W6 a1 } i# _
4*q*M*a*U*Q + 4*q*M*s*a*U + 4*q*M*s;3 d+ f1 E1 L' X: D
ContourPlot[c[r, z], {r, 0, 0.0001}, {z, 0.025, 0.035}]

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