产后访视至少4次。()
参考答案:错
一个物体从离地面80m高的地方做自由下落运动.求
(1)物体接触地面前一瞬间的速度
(2)落地前最后1s内的位移.
They are all interested in the newly-built apartments along the river, really want to buy them yet.
A.none of them
B.neither of them
C.none of whom
D.neither of whom