A.3:2:1,1:1:1 | B.32:22:1,3:2:1 |
C.5:3:1,3:2:1 | D.33:23:1,32:22:1 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
1 |
2 |
27at2 |
2 |
x |
t |
33 |
3t |
23 |
2t |
1 |
t |
A.10m/s | B.9.6m/s | C.8m/s | D.10.2m/s |
A.
| ||
B.
| ||
C.
| ||
D.
|
1 |
3 |
2 |
3 |
A.汽车全程的平均速度为22.5km/h | ||
B.汽车全程的平均速度为23.3km/h | ||
C.汽车后面
| ||
D.汽车后面
|
A.10m/s | B.11m/s | C.6m/s | D.12m/s |
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