单项选择题

A major advantage of the NAVTEX system when compared to other systems is that（）.

A.the information can be received on an ordinary FM radio
B.warnings are printed out for reading when convenient
C.broadcasts are at scheduled times
D.a low frequency band is used for long distance transmission

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单项选择题

A Class S EPIRB is a（）.

A.submarine EPIRB
B.safety EPIRB
C.ship EPIRB
D.survival craft EPIRB

单项选择题

A Class C EPIRB（）.

A.is primarily designed for vessels operating up to 50 miles offshore or on foreign waters
B.transmits a signal that can be detected by satellite
C.must be manually activated
D.operates in the medium and low frequency bands

单项选择题

A Class A EPIRB is NOT（）.

A.approved by the CCS
B.designed for float free，automatic activation
C.operated on 121.5/243 MHz
D.operated manually