3 |
2 |
gR |
1 |
2 |
v | 20 |
1 |
2 |
3 |
4 |
1 |
2 |
v | 20 |
1 |
2 |
v | 21 |
1 |
2 |
v | 22 |
gR |
| ||
R |
| ||
R |
gR |
1 |
2 |
v | 22 |
1 |
2 |
′ | 2C |
gR |
3 |
4 |
A.0.6v | B.0.4v | C.0.2v | D.1v |
S |
2 |
A.1:1 | B.1:2 | C.1:3 | D.1:4 |
A.若m1<m2,则 v1<0v2>0 | B.若m1<m2,则v1>0 v2>0 |
C.m1=m2,则v1=v2 | D.若m1=m2,v1=0 v2=0 |
3 |
|
|
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