苹果树上有一个质量为200g的苹果,它受的重力大小为_____N,方向___________。
1.96 竖直向下
观察急性传染病的预后,主要观察 ()
A.中性粒细胞的数量变化
B.淋巴细胞的数量变化
C.单核细胞的数量变化
D.嗜酸性粒细胞的数量变化
E.嗜碱性粒细胞的数量变化
—Did you see "Gossip Girl" last night?
—Yes. Leo fell _______ love _______ Gina while she was mad _______ him. Isn't that amazing! [ ]
A. in, and, at
B. at, with, in
C. in, at, with
D. in, with, at