你可能感興趣的試題

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

單項(xiàng)選擇題

Signals for locating will be transmitted in the 9GHz band by means of（）.

A.SART
B.DSC
C.NBDP
D.RT