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

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

（）will form the basis for distress alerting and safety calling.

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

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.

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

Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.

（）by an ice-breaker, it is important to maintain a continuous listening watch on the appropriate VHF channel and to maintain a proper look-out for sound and visual signals.

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