我国水果配送经历的阶段中,批发企业开始竞相向超市配送水果的阶段是()。
A.第一阶段
B.第二阶段
C.第三阶段
D.第四阶段
参考答案:B
A.s2-s1=aT2
B.s4-s1=3aT2
C.s1=aT2
D.打点2时物体的速度为v2=
—______?
—I'd like some vegetables with chicken and rice, please. [ ]
A. May I take your order
B. What do you do
C. Could you help me