單項(xiàng)選擇題

A red triangular daymark marks （）.

A.the centerline of a navigable channel
B.the starboard side of a channel
C.a prominent object of navigational interest that has no lateral significance
D.an area of a channel where passing another vessel is permitted

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單項(xiàng)選擇題

A rapid rise or fall of the barometer indicates（）.

A.heavy rain within six hours
B.a decrease in wind velocity
C.a change in the present weather conditions
D.that fog will soon set in

單項(xiàng)選擇題

A radar range to a small，charted object such as a light will provide a line of position in which form? （）

A.Straight line
B.Arc
C.Parabola
D.Hyperbola

A red triangular daymark marks （）.

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A rapid rise or fall of the barometer indicates（）.

A radar range to a small，charted object such as a light will provide a line of position in which form? （）

A radar range to a small，charted object such as a light will provide a line of position in which form? （）