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【单选题】
一做匀变速直线运动的质点，其位移随时间变化的关系式为x=4t+2t 2 ，x与t的单位分别是秒，则质点的初速度和加速度分别为（）A.
4m/s和2m/s 2
B.
0和4m/s 2
C.
4m/s和4m/s 2
D.
4m/s和0
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