單項選擇題The vertical movement of a vessel in the water is called（）.

A.pitch
B.sway
C.heave
D.roll


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1.單項選擇題The time required to incline from bow down to stern down and return to bow down again is called（）.

A.rolling period
B.amplitude moment
C.inclining moment
D.pitching period

2.單項選擇題The principal action in changing from transit to survival draft in the event heavy weather threatens is（）.

A.ballasting
B.deballasting
C.disconnecting
D.hanging off

3.單項選擇題The preferred method of controlling external bleeding is by（）.

A.direct pressure on the wound
B.elevating the wounded area
C.pressure on a pressure point
D.a tourniquet above the wound

4.單項選擇題The pitch of a propeller is a measure of the（）.

A.angle that the propeller makes with a free stream of water
B.angle that the propeller makes with the surface of the water
C.number of feet per revolution the propeller is designed to advance in still water without slip
D.positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without slip

5.單項選擇題The main reason a long towline is used during an oceantow is that（）.

A.a margin of safety is provided should the line part
B.the towline will wear more evenly
C.there will be less stress on the towline
D.a slight increase in speed will be realized