The SART should have sufficient battery capacity to operate in the stand-by condition for（）hours and should continuously work for（）hours.

A.VHF channel16 and 13
B.appropriate DSC distress and safety frequency
C.INMARSAT TDM message channel
D.VHF channel 70 and channel 8

A.urgent traffic
B.distress alert
C.routine traffic
D.NAVTEX message

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 it required and appropriate