单项选择题
A.concealed to prevent mechanical damage B.concealed so the boat can be maintained more easily C.protected from the weather D.in an accessible place behind the ceiling
DO NOT，REPEAT，NOT OVER-TAKE means that you should（）.A.o...
单项选择题DO NOT，REPEAT，NOT OVER-TAKE means that you should（）.
A.overtake B.not overtake C.overtake or not D.decide if you should overtake
By regulation，you MUST keep a record of the use of your...
单项选择题By regulation，you MUST keep a record of the use of your radiotelephone for at least（）.
A.one month B.four months C.six months D.one year
Automatic identification systems (AIS) are required to（...
单项选择题Automatic identification systems (AIS) are required to（）.
A.provide safety-related information automatically to shore stations，other vessels and aircraft B.receive safety-related information automatically from similarly equipped vessels C.exchange safety-related information with shore-based facilities D.All of the above
