A:give i
B:pick u
C:hand i
D:make u
—What do you think of a house supplied by Lovell?
— you buy a home from Lovell,the company promises to buy it back at the same price after three years.
下图表示人体生命活动调节机制的模式图,有关叙述中正确的是( )
质量为m的小球,从离地面高h处以初速度v0竖直上抛,小球能上升到离抛出点的最大高度为H,若选取该最高点位置为零势能参考位置,不计阻力,则小球落回到抛出点时的机械能是____.