（多）下列有关凸轮特点说法正确的是________
A. 凸轮机构能高速启动，动作准确可靠
B. 凸轮机构属低副接触，传递动力不宜过大
C. 容易磨损，不能保持良好的润滑
D. 凸轮的外廓形状取决于从动件的运动规律
（多）下列凸轮机构中属平面凸轮的是________
A. 圆柱凸轮
B. 盘形凸轮
C. 移动凸轮
D. 圆锥凸轮
（多）下列有关从动件运动规律说法正确的是________
A. 等速运动规律中位移曲线为一斜直线
B. 等速运动规律会产生柔性冲击
C. 等加速等减速运动规律的位移曲线是双曲线
D. 等加速等减速运动规律会产生柔性冲击
What are the similarities between litigation and coming down with the common cold?
A. Both of them cause severe damage to those involved.
B. Neither of them can be eliminated despite good efforts.
C. Both of them are infectious and have a widespread effect.
D. Precautionary measures can be taken against both of them.
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