单项选择题
THE SPEED OF A VESSEL ADJUSTED TO THAT OF A PILOT BOAT AT WHICH THE PILOT CAN SAFELY EMBARK is （）.
A.Ground speed B.Boarding speed C.Relative speed D.Speed of the vessel
单项选择题 The single letter G，sent by an icebreaker to an assisted vessel，means （）.
单项选择题 The radiotelephone required by the Vessel Bridge-to-Bridge Radiotelephone Act is for the exclusive use of （）.
单项选择题 The pilot station （） close west of the end of the breakwater．
