31. 依無線電規則要求，裝設有MF/DSC設備之船舶，遇險與安全之DSC頻率為多少KHz？ (A)2174.5 (B)2182 (C)2187.5 (D)3023

39. 翻譯：下一個轉向點約在2小時後。 (A)The time to the next reporting point is about 2 hours later. (B)The time to the next anchorage point is about 2 hours later. (C)The time to the next passing point is about 2 hours later. (D)The time to the next way point is about 2 hours later.