Вопрос № 306422 - Английский язык

Прочитайте текст и определите, какой из заголовков соответствует тексту.
In overseas communications, telegraph messages are transmitted over high-frequency radio (3-30 MHz), transoceanic submarine cables, or satellite communication channels. But it should be noted that the number of messages carried on high-frequency radio is constantly decreasing.
Most radio circuits operate directly between different countries of the world. As to radio telegraph transmitters, they are usually either of the frequency-shift-keying type or the single-side-band type.

Определите, является ли утверждение:

Amateur radio is noncommercial radio communications.

Определите, является ли утверждение:

The predictions concerning radio waves were made by 2 scientists approximately at the same time.

Определите, является ли утверждение:

The fading effect can be reduced by various electronic controls.

Определите, является ли утверждение:

The Global Positioning System is the most popular navigational system.

Определите, является ли утверждение:

‘Belly Box’ style controller is ideal for mobile communication.