64.承上題,若步進馬達以每秒180步之速度旋轉,則其轉速爲多少?
(A) 150 rpm
(B) 300 rpm
(C) 450 rpm
(D) 600 rpm
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統計: A(11), B(42), C(211), D(21), E(0) #970231
統計: A(11), B(42), C(211), D(21), E(0) #970231