选择题:生活中有许多现象都蕴含物理知识。下列说法正确的是( )

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题目内容:

生活中有许多现象都蕴含物理知识。下列说法正确的是( )

A.一块海绵被压扁后,体积变小,质量变小

B.人在站立和行走时,脚对水平地面的压强相等

C.乘坐地铁时抓紧扶手,是为了减小惯性

D.被踢飞的足球,在空中仍受到重力的作用

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