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【单选题】
一质点从静止出发沿半径 R =1 m 的圆周运动,其角加速度随时间 t 的变化规 律是 b = 12 t 2 - 6 t (S I) , 则质点的角速度 w =A.
4 t 3 - 3 t 2
B.
12 t 2 - 6 t
C.
24 t - 6
D.
( 4 t 3 - 3 t 2 ) 2
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举一反三
【简答题】listen to the tape, complete the following exercise
【简答题】listen to the tape and answer the two questions .
【简答题】香肠中含有的菌落总数属于 数据
【单选题】Listen to the tape.
A.
He suffered a fatal injury in an accident.
B.
He once served in a fire department.
C.
He was collecting building materials.
D.
He moved into his neighbor's old house.
【简答题】Listen to the tape and write down every word you have heard from the tape.