单项选择题
A.by day or at night B.almost round the clock C.somewhat and sometime D.from sunrise to sunset
When the power of a SART is on , it will（）.A.transmit d...
单项选择题When the power of a SART is on , it will（）.
A.transmit distress signal B.send response signal C.transmit the signal of ship‟s position D.be interrogated by X-band radar
The SART should provide a（）indication of its correct op...
单项选择题The SART should provide a（）indication of its correct operation and should also inform survivors when it is interrogated by radar.
A.sight or sound B.seeing or sounding C.visual or audible D.seeing or hearing
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
