单项选择题
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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相关考题
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单项选择题
The pitch ratio of a propeller is the mean pitch divided by （）.
A.the propeller diameter
B.the propeller radius
C.the pitch angle
D.the length of helix -
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 -
单项选择题
When a point rotates about an axis and, at the same time, moves parallel to that axis, it describes （）.
A.a line
B.a circle
C.a helix
D.an epllicate
