8.如图所示在河岸上用细绳拉船为了使船匀速靠岸拉绳的速度必须是 A.加速拉 b.减速拉 C.匀速拉 D.先加速后减速 Template




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tomski8.如图所示在河岸上用细绳拉船为了使船匀速靠岸拉绳的速度必须是 a.加速拉 b.减速拉 coloring