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【单选题】
以下关于工程中的常见约束的说法中,错误的是( )A.
滚动支座约束中，构件受到垂直于光滑面的支持力，约束结构的特点决定了其约束力的方向只能是垂直于接触面指向被约束物体；
B.
绝对的理想约束在实际工程中是不存在的；
C.
控制门或者窗户开关的合页（蝶铰链）可以视作是一个光滑圆柱铰链约束；
D.
链条约束与皮带约束类似，约束力只能沿着链条的方向背离被约束的物体。
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C.
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D.
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B.
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