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【多选题】
下面关于瞬时速度和平均速度的说法正确的是( )
A.
若物体在某段时间内每时刻的瞬时速度都等于零，则它在这段时间内的平均速度一定等于零
B.
若物体在某段时间内的平均速度等于零，则它在这段时间内任一时刻的瞬时速度一定等于零
C.
匀速直线运动中任意一段时间内的平均速度都等于它任一时刻的瞬时速度
D.
变速直线运动中任意一段时间内的平均速度一定不等于它某一时刻的瞬时速度
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