题目

如图所示，窗子上、下沿间的高度H=1.6m，墙的厚度d=0.4m，某人在离墙壁距离L=1.4m、距窗子上沿h=0.2m处的P点，将可视为质点的小物件以v的速度水平抛出，小物件直接穿过窗口并落在水平地面上，取g=10m/s2。则v的取值范围是（ ） A. v>7m/s                                                                   B. v<2.3m/s C. 3m/s<v<7m/s                                                          D. If you buy more than ten, they will knock 20 pence off________. A．a priceB．priceC．the priceD．prices