How to choose a suitable cable chain ? 
	Inner height: Select the thickest one of the built-in cables, oil pipes, gas pipes, water pipes, etc. 
	as the reference height, plus at least 10% of the height space as the inner height of the towline. 
	If overlapping, the actual height after overlapping is taken as the reference height.Inner width: Select some thicker cables, oil pipes, gas pipes, water pipes, etc. 
	The sum of their outer diameters is used as a reference for the inner width of the chain,and leave at least 10% of the width of the space. 
	Bending radius: Select the largest bending radius of the built-in cable, oil pipe,gas pipe, water pipe, etc. as a reference value, and leave more than 10% of the space. 
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