A. 1 B. 2 C. 3 D. 5
A black ball that is hoisted when the ship anchors B. A buoy attached to the anchor C. A buoy attached to the scope of an anchor chain D. A mark of the number of fathoms in an anchor chai
A. 正确 B. 错误
A. 中国 B. 日本 C. 美国 D. 英国