35 如果超音波脈衝期間(pulse duration)為 1 μs,而脈衝重複週期(pulse repetition period)為100 μs,
那麼能率因子(duty factor)為多少?
(A) 1%
(B) 10%
(C) 50%
(D) 100%
答案:登入後查看
統計: A(126), B(9), C(5), D(20), E(0) #1064789
統計: A(126), B(9), C(5), D(20), E(0) #1064789