17 下列何者是需在頻閃觀測鏡（stroboscopy）的光源下才觀察得到的喉部狀況？①ventricular fold compression ②phase symmetry ③vocal fold congestion ④periodicity regularity
(A)①②
(B)③④
(C)①③
(D)②④

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統計： A(4), B(17), C(10), D(56), E(0) #563895