A.一定是OA方向 | B.一定是OB方向 |
C.可能是OC方向 | D.可能是OD方向 |
A.1m/s | B.1.5m/s | C.2m/s | D.2.5m/s |
A.t1:t2:t3 |
B.3t1:2t2:t3 |
C.t1:(t1+2t2):(t1+2t2+3t3) |
D.2t1:(3t2+2t1):(6t3+3t2+2t1) |
A.I1<I2,W1=W2 | B.I1<I2,W1<W2 |
C.I1=I2,W1=W2 | D.I1=I2,W1<W2 |
A.4m/s | B.3m/s | C.2m/s | D.1m/s |
A.pA=pB | B.pA>pB | C.fA>fB | D.fA<fB |
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