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

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

出自：海船船员证

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