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

Every lifeboat which is fitted with a fixed two-way（）radiotelephone apparatus with an antenna which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in its operating position.

The priority of EGC messages is classified by（）.

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

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.

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

（）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.

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

The advantage of geostationary satellites is（）.