题目

—We had________really dry July last year. —I can’t remember________summer when it rained so little. A．a；a                                 B．a；/ C．/；the                               D．the；a 答案：A给滑块一初速度v0使它沿光滑斜面向上做匀减速运动，加速度大小为，当滑块速度大小减为时，所用时间可能是                                         (　　)A.                B.        C.               D.