Physics
In a refrigerator, the cooling system should always be

At the bottom
Can be anywhere
At the top
At the middle

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Physics
It is more difficult to walk on a sandy road than on a concrete road because

sand is soft and concreter is hard.
the friction between sand and feet is more than that between concrete and feet.
the friction between sand and feet is less than that between concrete and feet.
the sand is grainy but concrete is smooth.

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