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【单选题】
许多智能手机都有这样一个功能:你本来把手机竖着拿在手里的,你将它转90度,将它横过来,它的页面就跟随你的动作自动反应过来,也就是说页面也转了90度,极具人性化。这源于手机内部有一个重力感应器,它由一个重物和两个互相垂直的对力敏感的传感器组成,用来判定水平方向。关于手机竖着放和横着放时,重力感应器中的重物,下列说法正确的是 ( )A.
．重物受到重力的大小发生了变化
B.
重物受到重力的方向发生了变化
C.
．重物的重心发生了变化
D.
重物对每个传感器的力发生了变化
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A.
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B.
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C.
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