题目内容

______ is sea area A2.

An area within coverage of INMARSAT geostationary satellites
B. An area, excluding sea area A1, within coverage of Medium Frequency (MF) coastal radio stations in which continuous DSC alerting is available
C. An area within coverage of VHF coast radio stations in which continuous DSC alerting is available
D. The extreme polar regions

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A. MF radio installation with DSC
B. SES or HF with DSC
C. MF/HF radio telephone installation
D. 2,187.5 kMz watch receiver

A. Sea area A1.
B. Sea area A2.
C. Sea area A3.
D. Sea area A4.

A. COSPAS-SARSAT
B. 156.525 MHz DSC
C. 2, 187.5 kHz DSC and satellite EPIRB
D. 2, 182 kHz R/T and satellite EPIRB

A. MF radio installation with DSC
B. SES
C. MF/HF radio installation with DSC
D. 2, 187.5 kHz watch receiver