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【单选题】
下列关于压力的说法中正确的是 [     ]
A.
压力的大小总是等于物体的重力
B.
压力的方向总是竖直向下的
C.
压力的方向总是垂直于受力面
D.
压力的作用面积总是等于支持物体表面
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小学
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中学
C.
高中
D.
初中
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request
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A.
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B.
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A.
不能告诉访客有关住宿的资料
B.
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C.
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D.
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A.
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B.
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C.
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