单项选择题
A.12 hours
B.24 hours
C.48 hours
D.Advance notification is not required
单项选择题 The port of registry is（）.
单项选择题 The maritime labour certificate shall be issued to（）by the competent authority,or by a recognized organization duly authorized for this purpose.
单项选择题 Prior to taking over the deck watch in port,the relieving officer shall not be informed by the officer in charge of the deck watch as to（）.