mathematic模拟出只有个坐标轴，怎么解决Clear["Global`*"] qe = 1.602*10^-19 e = 2.72 ne = 2.13*10^21 \[Epsilon]0 = 8.85*10^-12 me = 9.109*10^-31 \[Mu]0 = 4*\[Pi]*10^-7 c = 3*10^8 Te = 5583 kB = 1.38*10^-23 Z = 0.1*10^-3 \[CapitalLambda] = (3*(\[Epsilon]0*kB*Te)^(3/2))/( 2*Sqrt[\[Pi]]*qe^3*Sqrt[ne]) vei = 4*Sqrt[(2*\[Pi])]*ne*Z^2*qe^4*Log[e, \[CapitalLambda]] \[Omega]pe = Sqrt[(ne*qe^2)/(\[Epsilon]0*me)] \[Omega] = (2*\[Pi]*c)/\[Lambda] \[Omega]B = (qe*B0)/me \[Lambda] = 10 kib = vei/c*\[Omega]pe^2/\[Omega]^2*1/(1 - \[Omega]B^2/\[Omega]^2)*1/ Sqrt[1 - \[Omega]pe^2/\[Omega]^2*1/(1 - \[Omega]B^2/\[Omega]^2)] Plot[kib, {B0, 0, 100}, PlotRange -> {0, 0.8}]