从理论上对两个定义下的矩形管道单位长度摩擦阻力进行了分析和论证。
Friction resistance of unit length of rectangular pipeline under the two definitions was analyzed and demonstrated theoretically.
水平烟管采用弹簧吊、中心滚动支座，可减少管道热膨胀移动时的摩擦阻力；
A horizontal smoke pipe adopts a spring suspender and a central roller support, and the friction resistance generated by the thermal expansion the pipe when moving is reduced.
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