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求两直线的公垂线的方程．

$$
L_1:\left\{\begin{array}{l}
x+2 y+5=0 \\
2 y-z-4=0
\end{array}, L_2:\left\{\begin{array}{l}
y=0 \\
x+2 z+4=0
\end{array}\right.\right.
$$
                        
不再提醒