送交者: Nixrreg 于 2012-03-23, 14:17:26:

回答: As a matter of fact, a actual 悬索 curve falls between catenary adn parabola, 由 alabama 于 2012-03-23, 13:36:54:

• What 中午怎么打出来的????????? - alabama (167 bytes) 2012-03-23, 14:29:22 (655189)

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