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

（）both anchors.

Some goods are missing（）terrible weather.

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? （）

The control of distress traffic is the responsibility of（）.

You are making a telephone call ship-to-shore using the VHF-FM service.You can tell that the working channel is busy if you hear（）.

Pilot Station，this is Chinese ship Jinsha（）.Over.

All VHF marine band radios operate in the simplex mode，which means that（）.

（），the cargo plan is not well done.

A mark or place at which a vessel comes under obligatory entry，transit，or escort procedure is know as（）.