单项选择题

The best time to work a boat into a slip is（）.

A.when the wind is against you
B.with the current setting against you
C.at slack water
D.with a cross current

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单项选择题

A.SW'ly direction along the NW coast of Africa
B.S'ly direction off the East Coast of Australia
C.NW'ly direction along the SW coast of Africa
D.SW'ly direction along the SE coast of Greenland

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Swell is the rise and fall of the ocean’s surface due to（）.

A.fetch
B.distant winds
C.local storms
D.the pull of the moon

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Stand of the tide is that time when（）.

A.the vertical rise or fall of the tide has stopped
B.slack water occurs
C.tidal current is at a maximum
D.the actual depth of the water equals the charted depth