单选题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 （）.Aa helixBa helicoidalCa curveDa cone
单选题
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
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