单项选择题

The cold ocean current which meets the warm Gulf Stream between latitudes 40°and 43°N to form the cold wall is called the（）.

A.North Cape Current
B.Labrador Current
C.Greenland Current
D.North Atlantic Current

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单项选择题

The apparent wind’s speed can be zero only when two conditions are present. One condition is that the true wind（）.

A.must be from dead ahead
B.speed must be zero
C.must be from dead astern
D.must be on the beam

单项选择题

The apparent wind can be zero when the true wind is from（）.

A.ahead and equal to the ship's speed
B.astern and equal to the ship's speed
C.ahead and equal to twice the ship's speed
D.astern and equal to twice the ship's speed