单项选择题

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

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单项选择题

Spring tides are tides that（）.

A.have lows lower than normal and highs higher than normal
B.have lows higher than normal and highs lower than normal
C.are unpredictable
D.occur in the spring of the year

单项选择题

River currents tend to（）.

A.Pick up speed where the channel widens
B.Run slower in the center of the channel
C.Hug the inside of a bend
D.Cause the greatest depth of water to be along the outside of a bend

单项选择题

Priming of the tides occurs（）.

A.at times of new and full Moon
B.when the Earth，Moon，and Sun are lying approximately on the same line
C.when the Moon is between first quarter and full and between third quarter and new
D.when the Moon is between new and first quarter and between full and third quarter