單項(xiàng)選擇題

The Vessel Bridge-to-Bridge Radiotelephone Act applies to（）.

A.every towing vessel of 16 feet or over in length while navigating
B.every vessel of 50 GT and upward，carrying one or more persons for hire
C.all aircraft operating on the water
D.every power-driven vessel of 20 meters and upward while navigating

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單項(xiàng)選擇題

The unit of duration of a dash in Morse Code is（）.

A.one and one-half times the length of a dot
B.twice the length of a dot
C.three times the length of a dot
D.four times the length of a dot

單項(xiàng)選擇題

The range of a SSB transmission is MOST affected by（）.

A.atmospheric noise and radiated power
B.the frequency band selected and time of day or night
C.interference and position of the moon
D.radiated power and nearness to shore

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The Vessel Bridge-to-Bridge Radiotelephone Act applies to（）.

你可能感興趣的試題

The unit of duration of a dash in Morse Code is（）.

The range of a SSB transmission is MOST affected by（）.

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