單項(xiàng)選擇題The expression FIRST MAGNITUDE is usually used to refer only to bodies of magnitude（）.

A.1.5 and greater
B.1.25 and greater
C.1.0 and greater
D.0.5 and greater


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1.單項(xiàng)選擇題The expression DROP ANCHOR means（）.

A.hold anchor
B.leave anchor
C.let go anchor
D.weigh anchor

2.單項(xiàng)選擇題The best method to stop a vessel from dragging anchor in a sand bottom is to（）.

A.reduce the length of the cable
B.pay out more anchor cable
C.back the engines
D.swing the rudder several times to work the anchor into the bottom

4.單項(xiàng)選擇題In radiotelephone communications，the prefix PAN-PAN indicates that（）.

A.a ship is threatened by grave and imminent danger and requests immediate assistance
B.a calling station has an urgent message about the safety of a person
C.the message following the prefix will be about the safety of navigation
D.the message following is a meteorological warning

5.單項(xiàng)選擇題Fog forms when the air（）.

A.is 50% water saturated
B.is 90% water saturated
C.temperature is greater than the dew point temperature
D.temperature is equal to，or below the dew point temperature