_____ are my good friends. [ ]
A. You and he
B. He and you
C. You and him
D. Him and you
答案:A
质量为100g小钢球,从离地板高5m处自由下落,跟地板碰撞后反弹高度是3.2m,设碰撞时间为0.1s,则小球在碰撞过程中动量变化大小为_______kg.m/s,球对地板的作用力是_____N.(g=10m/s2)
继发性青光眼引起眼压升高的原因
A.晶体混浊
B.眼球内容增加
C.眼外伤
D.房水排出多阻
E.散瞳造成