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

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.

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.

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

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

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

Distress traffic is the communication（）between the station in distress and the ships, aircraft, coast radio stations, coast earth stations and rescue centers participating in the rescue work.

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

On-scene communications will normally take place between（）.

The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.