accidental factor
1.6.The Artifical Neural Networks has vast and applied foreground in the information construcionof deep foundation excluding the accidental factor.
2.The secondary disasters(post-earthquake fire) under certain conditions and the accidental factor of the collective activity also influence the death toll.
3.Among these technical innovations,there are thirty five innovations that invented successfully by the players and coaches through practice and explore and accidental factor,and only eight innovations that invented by the scientific research personnels.
