50 海圖符號燈塔燈光「固定不變之光」其符號為下列何者?
(A)F
(B)F1
(C)Oc
(D)Al
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統計: A(15), B(0), C(0), D(0), E(0) #2695530
統計: A(15), B(0), C(0), D(0), E(0) #2695530