你可能感興趣的試題

單項(xiàng)選擇題

What is the fundamental purpose for imposing radio silence? （）

A.To ensure that interference to proprietary communications is minimized
B.To ensure that only voice communications can be effected on the distress frequency or channel
C.To ensure that a distressed vessel will have a "window" twice each hour for transmitting routine messages
D.To ensure that interference on a particular frequency or channel to communications concerning emergency traffic is minimized

單項(xiàng)選擇題

What is the calling and distress frequency on a single side band (SSB) marine radiotelephone?（）

A.1492 kHz
B.1892 kHz
C.2082 kHz
D.2182 kHz

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When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.

你可能感興趣的試題

What is the fundamental purpose for imposing radio silence? （）

What is the calling and distress frequency on a single side band (SSB) marine radiotelephone?（）

When a vessel signals her distress by means of a gun or other explosive signal，the firing should be at intervals of approximately（）.