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【单选题】
下列 不是平面连杆机构的优点。A.
运动副是面接触，故压强低，便于润滑、磨损小
B.
运动副制造方便，容易获得较高的制造精度
C.
容易实现转动、移动基本运动形式及其转换
D.
容易实现复杂的运动规律
拍照语音搜题，微信中搜索"皮皮学"使用
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A.
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B.
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C.
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D.
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