单项选择题
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
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单项选择题
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 -
单项选择题
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 -
单项选择题
The forward movement of a ship in one revolution of its propeller is measured by（）.
A.advance
B.head reach
C.pitch
D.transfer
