前者的设计依据是沿线土壤的电阻率及输电线路与管道交叉等参数，后者主要是加压站内深井阳极地床。
The former's major design basis is the parameter of soil resistivity along the pipeline, the crossings of high-voltage DC transmission line with the pipeline etc.
交叉二直线的连接问题在管道、道路、桥梁、隧道等工程中经常遇到。
Problems concerning joining two skew lines are often met in engineering of pipes, roads, Bridges, channels, etc.
为解决管道微机器人在微小空间内的交叉轴传动问题，研制了微小弹性啮合轮的传动机构。
A novel drive mechanism named micro-elastic mesh wheel was developed to transfer power between the cross axes in a limited space by in-tube micro robot.
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