單項選擇題

You are anchoring in a river where the current is from one direction only.The best way to lay out two anchors is to have them（）.

A.Directly in line with the bow
B.Side by side，with their lines on the port and starboard side
C.So that their lines form an angle
D.On top of one another

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單項選擇題

Which statement is TRUE concerning equatorial tides（）.

A.They occur when the Sun is at minimum declination north or south
B.They occur when the Moon is at maximum declination north or south
C.The difference in height between consecutive high or low tides is at a minimum
D.They are used as the basis for the vulgar establishment of the port

單項選擇題

Which statement is TRUE concerning apogean tides（）．

A.They occur only at quadrature
B.They occur when the Moon is nearest the Earth
C.They cause diurnal tides to become mixed
D.They have a decreased range from normal