单项选择题
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
Signals for locating will be transmitted in the 9GHz ba...
单项选择题Signals for locating will be transmitted in the 9GHz band by means of（）.
A.SART B.DSC C.NBDP D.RT
A ship station on receiving a shore-to-ship distress al...
单项选择题A ship station on receiving a shore-to-ship distress alert should（）.
A.keep silence B.interfere with such communication C.establish communication as directed and render such assistance as is required and appropriate D.refuse communication as directed and render such assistance as is required and appropriate
What channel is general communication used?（）A.any appr...
单项选择题What channel is general communication used?（）
A.any appropriate channel except public communication B.any appropriate channel except for public communications C.any appropriate channel besides public communication D.any appropriate channel beside public communication
