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【单选题】
在狭义相对论中,下列说法正确的是A.
物体的固有长度是指地面参考系测出的物体长度
B.
动钟变慢是指固有时总是大于运动时
C.
一个惯性系同时发生的两个事件,从另外惯性系来看,一定是不同时的
D.
空间两点的距离与观察者运动状态有关,不是绝对不变的
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