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（）.

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? （）

There is a VHF set（）the front of the wheelhouse.

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? （）

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

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

I’d like to know something about the cargo condition at the loading port（）detail.

The height of a VHF radio antenna is more important than the power output wattage of the radio because（）.

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

My ship（）that port next month.