At least two two-way VHF radiotelephone apparatus shall be provided on every cargo ship of（）tons gross tonnage and upwards but less than 500 tons gross tonnage.

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

（）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.

Every ship constructed on or after（）shall comply with all the applicable requirements of this chapter.

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

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

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

Radio beacon can be activated（）in case of distress.

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

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.