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單項選擇題

On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.

A.vessel being towed
B.fishing vessel engaged in trawling
C.vessel at anchor warning you of her location
D.power-driven pilot vessel on station underway

單項選擇題

On the approach of a warm front the barometric pressure usually（）.

A.falls
B.rises
C.is steady
D.is unreliable

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Periodic publications notifying changes in，or additions to，previously published navigational data are（）.

你可能感興趣的試題

On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.

On the approach of a warm front the barometric pressure usually（）.

Periodic publications notifying changes in，or additions to，previously published navigational data are（）.

On the high seas，a fog signal consisting of one prolonged blast followed by four short blasts would indicate the presence of a（）.