送交者: JFF 于 2009-11-13, 19:42:28:

回答: It is hard to imaging a civil engineer to make a mistake like this 由 008 于 2009-11-13, 19:38:44:

• you may also find it as an example from a textbook something like - JFF (40 bytes) 2009-11-13, 19:46:11 (385803)

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