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.

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.

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

All coast radio stations（）DSC installed for VHF and HF.

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

COSPAS-SARSAT is intended to be used for（）.

For COSPAS-SARSAT system,（）usually transmit initial COSPAS-SARSAT alert.

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

SOLAS ships shall be equipped with（）.

Before GMDSS, if the radio officer on board is serious ill,（）.