单项选择题
A.DF B.Radar System C.DSC System D.COSPAS-SARSAT
What information will a distress alert contain?（）A.natu...
单项选择题What information will a distress alert contain?（）
A.nature of distress B.type of assistance required C.course and speed and time at which the information was recorded D.A, B, C are all right
The ARQ mode should be applied（）.A.when two stations co...
单项选择题The ARQ mode should be applied（）.
A.when two stations communicate with each other B.in any radio system and at any time C.when one ship sends a message to another station D.for communication among some stations
It is required that ships proceeding at sea should keep...
单项选择题It is required that ships proceeding at sea should keep continuous watch on（）.
A.VHF channels 16 and 13 B.Appropriate DSC distress and safety frequencies C.INMARSAT TDM message channel D.VHF channel 70 and channel 8
