（）is an area within the radiotelephone coverage of at least one VHF coast station in which continuous Digital Selective Calling is available.

Each satellite broadcasts（）traffic on a designated channel.

For many years marine centrifuges were designed for （） operation, that is the machines were run for a period during which solids accumulated in the bowlThe machine was stopped when the accumulated solids began to impair its performance.

When comparing analog display inputs to digital display inputs, which of the following is anadvantage that digital has over analog?（）

Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.

Which logical channel is used to transfer signaling messages such as resource reallocation？（）

Every lifeboat which is fitted with a fixed two-way VHF radiotelephone apparatus with（）which is separately mounted shall be provided with arrangements for sitting and securing the antenna effectively in is operating position.

Which channel is designated for VHF Digital Selective Calling?

is a device which enables digital microcomputers to communicate across analog telephone lines。

Which benefit does digital subscriber line (DSL) systems for broadband access provide to the user?（）

A passenger plane is able to carry a fixed weight, including passengers and fuel.Which wing design would be best for such a plane?

Channel 13 is primarily used for ship to ship communication. Channel 13 is also authorized for（）.