The pushbutton on the handset of a ships sound-powered telephone must be depressed to ().
A、talk then released to listen
B、listen then released to talk
C、both talk and listen
D、ring the station being called
A、talk then released to listen
B、listen then released to talk
C、both talk and listen
D、ring the station being called
A、the 1st to the 10th B、the 11th to the 20th C、the 1st to the 15th D、the 16th to the last day of such month
A、the 1st to the 10th B、the 11th to the 20th C、the 1st to the 15th D、the 16th to the last day of such month
A、the 1st to the 10th B、the 11th to the 20th C、the 1st to the 15th D、the 16th to the last day of such month
A、help keep the deck dry B、prevent stress concentrations on the stringer plate C、protect against twisting forces exerted on the frame of the vessel D、reinfo ce th eside stringers