Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.

If the beacon is mounted at a wrong place, it may（）by sea water, chemicals, exhaust and vibrations.

Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.

Radio beacon can be activated（）in case of distress.

All coast radio stations（）DSC installed for VHF and HF.

（）will form the basis for distress alerting and safety calling.

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.

The vessel has stayed in port for seven days because she needs（）.

The frequency（）the safety message will be transmitted shall be included in DSC safety call.

The rescue coordination center may（）on stations which interfere with traffic.