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【单选题】
如图所示,在匀速转动的圆筒内壁上紧靠着一个物体,物体随筒一起转动,物体所需的向心力由下面哪个提供 ( )A.
重力
B.
弹力
C.
静摩擦力
D.
滑动摩擦力
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A.
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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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A.
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B.
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C.
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D.
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