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

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

Please use（）for（）.

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.

Stations in the United States of America are grouped by states arranged in the alphabetical order of their（）.

In case a ship is in emergency or distress in any of 4 areas, it is required to use the continuous（）alert.

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

Can MF/HF radiotelephone receive the MSI sent from the coast stations alone?（）

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

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