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还是这道题 
\begin{aligned}&20、(12分)已知向曲线L是球面x^2+y^2+z^2=2x\text{ 与平面}&2x-z-1=0\text{ 的交线,从}z\text{轴正向往}z\text{ 轴负向看为逆时针方}&\text{向,计算曲线积分}&I=\int_L\left(6xyz-yz^2\right)\mathrm{d}x+2x^2z\mathrm{d}y+xyz\mathrm{d}z .\end{aligned}