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已知一个质点作变速直线运动的位移函数S=3t^2+e^2t,t为时间,则在时刻t=2处的速度和加速度分别为
A.12+2e^4,6+4e^4B.12+2e^4,12+2e^4C.6+4e^4,6+4e^4D.12+e^4,6+e^4...
A.12+2e^4,6+4e^4
B.12+2e^4,12+2e^4
C.6+4e^4,6+4e^4
D.12+e^4,6+e^4 展开
B.12+2e^4,12+2e^4
C.6+4e^4,6+4e^4
D.12+e^4,6+e^4 展开
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