单项选择题
Which of the following is not an operation mode of AIS?（）
A.A ship-to-ship mode B.A ship-to-shore mode C.Integrated with a vessel traffic system D.Sending out information through broadcast automatically
单项选择题 （）is where the crew eat their meals.
单项选择题 When the wave period and the apparent rolling period are the same（）.
单项选择题 In the Northern hemisphere northerly winds may cause temperature（）.
