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

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

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.

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

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.

Please use（）for（）.

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（）.

Particular care should be（）in selecting CESs in areas where Ocean Regions overlap.

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