4.如图在河岸上用细绳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——青夏教育精英 Template




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tomski4.如图在河岸上用细绳拉船为了使船匀速靠岸拉绳的速度必须是 a. 加速拉 coloring