The quality of EGC messages is（）affected by the position of the ship, the time of reception and climatic conditions.

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.

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.

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

SOLAS ships shall be equipped with（）.