你可能感興趣的試題

Automatic identification systems（AIS）are required to（）.

A.provide safety-related information automatically to shore stations，other vessels and aircraft
B.receive safety-related information automatically from similarly equipped vessels
C.exchange safety-related information with shore-based facilities
D.All of the above

單項(xiàng)選擇題

（）is not a component of GPS.

A.He space component
B.Control component
C.User component
D.Alarming component

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If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.

你可能感興趣的試題

Automatic identification systems（AIS）are required to（）.

（）is not a component of GPS.

If the radio signal ground wave extends out for less distance than the minimum skywave distance，there is an area in which no signal is received．This is called the（）.