单项选择题
How can you estimate the position of a tropical storm’s center?（）
A.With a radio weather bulletin or weather fax B.using shipboard radar C.observe the wind direction and apply Buys Ballot's law D.All of the above
单项选择题 How can the Coast Guard determine that a crew member is “able to understand any order spoken by the officers”?（）
单项选择题 How are riveted lap joints made watertight?（）
单项选择题 Hot air can hold（）.
