For laying indoors, in tunnels or cable trench, unable to bear external mechanical forces. Singlecore cable in magnetic duct is not permissible.
室内、隧道及电缆沟等场所，不能承受机械外力。单芯电缆不允许敷设在磁性管道中。
In pipe laying and lifting analysis, the contact condition between pipeline and seabed, including deflection, rotation Angle and bending moment, is sometime tricky in a normal mechanical model.
海底管道的铺设分析和提升分析都用到管道和海床之间的接触条件，这个同时含有挠度、转角和弯矩的接触条件，在一般的力学模型中是很难理解的。
For laying in doors, in tunnels, in cable trench or direct in ground, able to bear external mechanical forces, but unable to bear large pulling force.
室内、隧道、电缆沟内或埋地等能承受机械外力的场所，但不能承受大的拉力。
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