单项选择题
A.Read the display screen and/or printout
B.Silence the alarm
C.Listen for any follow up voice/telex transmission on the appropriate frequency
D.All of the above
单项选择题 Where should the GMDSS radio log be kept on board ship（）.
单项选择题 When the GMDSS Radio Operator on watch hears“SECURITE”spoken three times he can expect to receive a message concerning（）.
单项选择题 What publications should a GMDSS Operator consult regarding the proper set-up and operation of vessel equipment（）.