Ship-to-ship distress alerting should be conducted by（）.

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

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.

Radio communication（）for many years and helps to save tens of thousands of lives.

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

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

The priority of EGC messages is classified by（）.

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.

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

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