A.1m | B.0.5m | C.
| D.2m |
xAC |
2T |
5 |
2T |
△x |
T2 |
1 |
T2 |
5 |
2T |
1 |
T |
3 |
2T |
vA2 |
2a |
| ||
|
9 |
8 |
A.空降兵展开伞时离地面高度至少为125m,相当于从2.5m高处自由落下 |
B.空降兵展开伞时离地面高度至少为125m,相当于从1.25m高处自由落下 |
C.空降兵展开伞时离地面髙度至少为99m,相当于从1.25m高处自由落下 |
D.空降兵展开伞时离地面高度至少为99m,相当于从2.5m高处自由落下 |
A.1:3:5 | B.3:5:7 | C.1:2:3 | D.3:5:6 |
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