题型:报关编码 (多选)一质点做直线运动,零时刻在坐标原点,初速度v0>0,其加速度a>0,此后a逐渐减小至零,以下说法正确的是 ( )A.速度的变化越来越慢B.速度逐渐变小C.位移逐渐变小D.位移、速度始终为正值 查看答案
题型:报关编码 The theme of World Environment Day 2012 is “Green Economy: Does it include you?” Which of the following is most probably the poster for it?A.B.C.D. 查看答案