— is the ticket of the museum for children?— Well, it's free for everyone.
A:How long
B:How much
C:How far
D:How many
关于串.并联电路,下列说法正确的是( )
Can I help you?
甲、乙两辆汽车都沿公路匀速直线向东运动,其路程s随时间t变化的图象如图所示.从图象可知,甲车的速度是 ____m/s;以甲车为参照物,乙车向 ____运动.
生物进化的总体趋势是:____,____,____.