单项选择题
My ETA（）Cheng Shan Tou lighthouse is 0900 hours local time.
A.of B.in C.on D.at
单项选择题 What（）your registry port, over.
单项选择题 After transferring a weight forward on a vessel，the draft at the center of flotation will（）.
单项选择题 In order to ensure that a RACON signal is displayed on the radar，you should（）.
