The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...
摆逆运动中与动定角的直,其包络也是圆周渐开.
The envelope of moving line on the hypocycloid plane may be an epicycloid or cardioid and the...
摆逆运动中与动定角的直,其包络也是圆周渐开.
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