Counter-offers are _______________ to the original offer. Once a counter-offer is made, the original offer shall be automatically ________________ .
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【单选题】A 2.0kg sloth (懒熊) hangs on a limb 5.0m above the ground. I f we take the reference point y = 0 to be at the ground with potential energy U = 0, w hat is the gravitational potential energy U of the sl...