某人在岸边用绳牵引小船匀速靠岸的过程中如图a 2所示若水对船的阻力不变则下列说法正确的是 A.拉绳速度始终不变b.绳子拉力始终不变 Template




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tomski某人在岸边用绳牵引小船匀速靠岸的过程中如图a 2所示若水对船的阻力不变则下列说法正确的是 a.拉绳速度始终不变b.绳子拉力始终不变 coloring