156 一轉盤以120rpm作等角速度轉動,其角速度為若干rad/sec?
(A)4π
(B)20π
(C)120π
(D)240π
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統計: A(91), B(9), C(13), D(4), E(0) #298394
統計: A(91), B(9), C(13), D(4), E(0) #298394