单项选择题
Before sailing for a foreign port，what document must you get?（）.
A.The Policy of insurance B.The Report of Entrance C.The Clearance D.The Pratique
单项选择题 Before leaving port on an ocean tow，a tug captain should assure himself of all the following EXCEPT（）.
单项选择题 Before any machinery is put in operation，you should（）.
单项选择题 Among the possible causes of unexpected constant inclination of the floating shhip is（）.
