— Three times a week.
A:How many
B:How much
C:How often
D:How long
甲、乙两个物体在t=0时的位置如图a所示,它们沿x轴正方向运动的速度图象分别如图b中图线甲、乙所示,则( )
下列说法中正确的是( )
依据继承法的规定,第一顺序继承人是( )
____