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

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

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

（）your present speed?

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

The weather is often（）in a high-pressure area.

A call between any two ship stations on an intership working frequency shall have a maximum duration of（）.

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? （）

（），the cargo plan is not well done.

How（）the cargo at loading port?