單項選擇題

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

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單項選擇題

Set of current is（）.

A.its velocity in knots
B.direction from which it flows
C.estimated current
D.direction toward which it flows

單項選擇題

Scouring is the result of（）.

A.interruption of the normal current flow by the footing
B.elevating in mud-slide zones
C.penetrating rapidly through a hard crust into weaker soils
D.extracting legs from soils with high cohesion