A.the speed of the vessel
B.the speed of the propeller
C.the wake
D.the wake fraction
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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
A.a line
B.a circle
C.a helix
D.an epllicate
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