單項選擇題

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

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單項選擇題

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

單項選擇題

A quick and rapid motion of a ship in a seaway is an indication of a(n) （）.

A.large GM
B.high center of gravity
C.excessive free surface
D.small GZ