A.ahead direction
B.astern direction
C.right-handed
D.left-handed
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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
A.dependent
B.in dependent
C.in series
D.in parallel
A.one-third
B.two-thirds
C.one-fourth
D.two-fourths
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