In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.

At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.

By using（）system a ship can send a distress message and know with certainty it will be received.

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.

We consider（）send a helicopter with medical facilities to the distress area.

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.

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（）.