次数n/次 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
x0/cm | -1 | -2 | -3 | -4 | - 5 | -6 | -7 | -8 | -9 |
x1/cm | -0.90 | -0.20 | 0.60 | 2.40 | 5.00 | | 12.60 | 17.58 | 21.00 |
A.杆对a不做功; |
B.杆对b不做功; |
C.杆对a做负功; |
D.杆对b做负功。 |
A.0 | B. | C. | D. |
A.= | B.=2 |
C.>2 | D.<<2 |
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