划线处应填入的代码为?( )
>import matplotlib.pyplot as plt
>import numpy as np
>x=np.linspace(0,2,50)
>plt.plot(x,x2,label=“quadratic”)
>plt.plot(x,x3,label=“cubic”)
>plt.xlabel(“X axis”)
>plt.title(“Simple Plot”)
plt.legend()
plt.show()
plt.ylabel()
plt.ylabel(“Y axis”)
plt.ylim(“Y axis”)
plt.ylim()