A.0~967
B.0~033
C.0~031
D.0~969
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A.the speed of the vessel
B.the speed of the propeller
C.the wake
D.the wake fraction
A.the higher
B.the lower
C.the faster
D.the slower
A.ahead direction
B.astern direction
C.right-handed
D.left-handed
A.the propeller diameter
B.the propeller radius
C.the pitch angle
D.the length of helix
A.a helix
B.a helicoidal
C.a curve
D.a cone
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