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.

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.

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

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

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

The priority of EGC messages is classified by（）.

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

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

Ship-to-ship distress alerting should be conducted by（）.