单项选择题
When a tug is pulling on a hawser at right angles to the ship，and the pilot wants to come ahead or astern on the ship’s engine，care must be taken that the pilot（）.
A.does not break the towline B.does not get too much way on the vessel C.keeps a steady course so the towline will remain tight D.turns the ship toward the direction of pull
单项选择题 When a pilot is on board to pilot the vessel the Letter （） must be hoisted．
单项选择题 Vessels must （） pilot at waiting anchorage．
单项选择题 There shall be two principal （） through the harbor for the passage of vessels of over 60 tons burden．
