单项选择题

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

A.Supplements
B.Annual Summary
C.Navigational Warnings
D.Notices to Mariners

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单项选择题

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

单项选择题

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

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

单项选择题

On a nautical chart，the inner ring of a compass rose indicates（）.

A.true directions
B.compass error
C.deviation
D.magnetic directions