送交者: coubert 于 2009-09-16, 16:29:31:

回答: Roughly speaking 由 gyro 于 2009-09-16, 15:59:21:

• F=mg is a good approximation if the initial rod position - gyro (155 bytes) 2009-09-16, 17:24:25 (365280)

加跟贴