4. 圖列所示國際信號旗依規定其意義為何？ (A) 3 E I P I (B) 3 E I P 3 (C) 3 E I P P (D) 3 E I PＥ

12. A vessel is seen showing three shapes in a vertical line; the top and bottom ones are black balls and the middle one is a black diamond. What does this daytime signal indicate? (A) It is a vessel engaged in dredging. (B) It is a vessel restricted in her ability to manoeuvre. (C) It is a vessel at anchor. (D) It is a vessel engaged in a mine clearance operation.