A.countries
B.states
C.names
D.groups
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A.one
B.two
C.three
D.four
A.a dummy antenna
B.a supporting facilities
C.a back-up equipment
D.an antenna
A.one-way
B.two-way
C.double-effect
D.one-effect
A.distress
B.urgent
C.safety
D.general
A.call sign
B.port of register
C.radio name
D.signal label
最新試題
Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.
Every lifeboat which is fitted with a fixed two-way vhf radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.
Please use（）for（）.
The priority of EGC messages is classified by（）.
Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.
Radio communication（）for many years and helps to save tens of thousands of lives.
（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.
International Navtex service means the coordinated broadcast and automatic reception on（）khz of maritime safety information by narrow-band direct-printing telegraphy using English language.
For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.
SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.