问题
选择题
--- What's one fourth and a half, do you know?
--- Yes, it's _________.
A．two sixths
B．three fourths
C．one three
D．three sixth
答案
答案：A
搜题请搜索小程序“爱下问搜题”
--- What's one fourth and a half, do you know?
--- Yes, it's _________.
A．two sixths
B．three fourths
C．one three
D．three sixth
答案：A
如图，物体在X轴上做直线运动，0时刻从O点向右运动，此后各时刻的位置如表所示．
| 时刻t（s） | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| 位置x（m） | 0 | 8 | 14 | 18 | 20 | 18 | 14 | 8 | 0 |
A．该物体一定做匀变速直线运动
B．该物体可能做匀变速直线运动
C．第2内与第4秒到第6秒内的位移相同
D．以上说法都错误