If you know that the vessel you are about to call on the VHF radio maintains a radio watch on both the working and the calling frequencies，which frequency should you call on? （）

Vessels wishing to communicate with the Port Health Officer should do（）on VHF Channel 14.

Should that kind of weather（），the two ships would touch each other.

The present voyage of my ship began at the port of Shanghai after loading 8 000 tons of Cargo on board and ended after discharging the Cargo at the port of Hong Kong，which was（）.

Do you require any further assistance ? My ship is safe now and no assistance is necessary.This VHF communication generally takes place during（）.

What does the abbreviation VHF stand for?（）

Some goods are missing（）terrible weather.

One hour before arrival at Elbe 1 light vessel，masters are advised to contact the pilot boat by（）.

The generators on your rig have shut down，leaving you without navigation lights. Which emergency signal would you transmit over the VHF radio to alert vessels in the area of your predicament? （）

There is a drifting mine（）in position 21 degrees 31 minutes North 124 degrees 20 minutes East.