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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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
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D.positive pressure resulting from the difference of the forces on both sides of the moving propeller in still water without slip

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The main reason a long towline is used during an oceantow is that（）.

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The forward movement of a ship in one revolution of its propeller is measured by（）.

A.advance
B.head reach
C.pitch
D.transfer