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

What following is not among the function of SOLAS ships?（）

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

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

SafetyNet is an international service for the broadcast and automatic reception of MSI by means of direct-printing through（）system.

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

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.

The advantage of geostationary satellites is（）.

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

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