如图甲所示利用拉力f将木块从一个弯折的管道左端拉进右端拉出.已知竖直管口对木块的挤压作用完全相同并测得拉动全过程中拉力和木块移动速度随 Template


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tomski如图甲所示利用拉力f将木块从一个弯折的管道左端拉进右端拉出.已知竖直管口对木块的挤压作用完全相同并测得拉动全过程中拉力和木块移动速度随 coloring