A theorem on kinetic energy for variable mass-point and formula of work of recoil internal forces are given and the reason of soft-rope query is discussed.
给出变质量质点的动能定理和一对反推内力作功的表达式，并由此给出软绳问题的正确解释。
Main products are: the soft-core variety wire rope hose soft-shaft assembly manipulation of soft-warming breeze manipulating cables pushing cable car multifunctional hand brake.
主要产品有：各种软轴内芯、钢绳、软管、软轴总成、暖风机操纵软轴、操纵钢索、推拉索、汽车多功能手制动器。
Main products are: the soft-core variety wire rope hose soft-shaft assembly manipulation of soft-warming breeze manipulating cables pushing cable car multifunctional hand brake.
主要产品有：各种软轴内芯、钢绳、软管、软轴总成、暖风机操纵软轴、操纵钢索、推拉索、汽车多功能手制动器。
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