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To distinguishes to have cold water

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To distinguishes to have cold water
and in abundantly the hot water two cups joins drop of ink respectively,and mixes separately.Which proliferation quick?Why?
向分别盛有冷水和热水的两个杯子里各加入一滴墨水,并分别搅动.哪个扩散的快?为什么?
To distinguishes to have cold water
热水.
因为温度会加快分子的运动.