单项选择题
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
General radio communications in the global system are t...
单项选择题General radio communications in the global system are those between（）concerning the management and operation of the ships and may have impact on their safety.
A.SAR party and the ship in distress B.SAR authorities and the ship in distress and survival craft C.A ship station and any coast station D.Ship stations and shore-based communication network
