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【单选题】
工程技术上的摩擦离合器是通过摩擦实现传动的装置，其结构如图所示。轴向作用力可以使1、2两个飞轮实现离合。当1轮和2轮结合，1轮通过摩擦力矩带动2轮转动时，则此刚体系统在两轮结合前后（ ）【图片】
A.
角动量改变，动能亦改变
B.
角动量改变，动能不变
C.
角动量不变，动能改变
D.
角动量不变，动能亦不改变
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