39.當船舶從事危險品貨物裝卸時，應顯示之警告標誌為：
(A)A flashing yellow light
(B)A green light visible all around the horizon
(C) A red light visible all around the horizon
(D)A flashing green light

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統計： A(3), B(5), C(15), D(1), E(0) #1220303