A、has been used
B、have been used
C、has used
D、have used
更多“Radio communication（）for many years and helps to save tens of thousands of lives.”相关的问题
A、GMDSS radio logs are required to contain entries pertaining to all incidents connected to radio communication service which appear to be of importance to the safety of life at sea B、All distress communications must be entered in the GMDSS radio log C、Both of the above D、None of the above
A、general radio communication B、MSI C、improved distress and safety communication D、bridge-to-bridge communication
A、A.Each compulsory vessel must carry at least two licensed GMDSS Radio Operators at all times while at sea B、B.Each compulsory vessel must carry at least two licensed Radio Operators at all times while at sea and may elect to carry a GMDSS Radio Maintainer as well C、C.Communications involving safety of life at sea do not have to be logged as long as the compulsory vessel was not involved in such communications D、D.While at sea，adjustments to，and the maintaining of，GMDSS equipment may be performed by the GMDSS Radio operator as long as the work is supervised by an onboard licensed GMDSS Radio Maintainer
A、Admiralty List of Lights and Fog Signals B、Admiralty Maritime Communications C、Admiralty List of Radio Signals D、Admiralty Digital List of Lights
A、Radio checks and time checks B、Inter-vessel safety and search and rescue C、Working with helicopters D、Radio direction finding
A、taking the place of the radio system B、introducing a new life-saving system C、saving the vessels in distress D、improving the communication on land
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
客服
TOP
查看正确答案
