单项选择题
Wake varies considerably with the form of the vessel, but, generally speaking, the bluffer the ship （） the wake value.
A.the higher
B.the lower
C.the faster
D.the slower
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When viewed from astern, if the propeller revolves in a clockwise direction when going ahead, it is known as （）.
A.ahead direction
B.astern direction
C.right-handed
D.left-handed -
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The pitch ratio of a propeller is the mean pitch divided by （）.
A.the propeller diameter
B.the propeller radius
C.the pitch angle
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单项选择题
If a line at right angles to the axis rotates about that axis and, at the same time, moves parallel to the axis, it will generate （）.
A.a helix
B.a helicoidal
C.a curve
D.a cone
