单项选择题
The only type of helicopter that may be refueled with the engine running and the blades turning is（）.
A.a helicopter carrying cargo only B.a turbine-equipped helicopter C.a Sikorsky D.a helicopter carrying injured personnel in an emergency situation
单项选择题 The most likely location for a liquid cargo fire to occur on a tanker would be（）.
单项选择题 The major cause of anchor buoy pendant wire failures is（）.
单项选择题 The distance gained in the direction of the original course when you are making a turn is known as（）.
