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

（）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.

Monitoring is especially important in a highly automated system which is dependent on careful（）procedure and format.

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.

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

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

Radiotelephony communication or radio telex communication or both will be carried out by terrestrial or satellite means,（）the equipment fitted on ship and the area in which the incident occurs.

As each MSI message will have a unique identity, the printing of messages already received correctly is（）.

Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）