42 Killed 7 Children Bus Crashes Mountainous Highway Safety Experts Warn Of Deadly Risk Schools Keep Taking With Kids As

42 Killed 7 Children Bus Crashes Mountainous Highway Safety Experts Warn Of Deadly Risk Schools Keep Taking With Kids As

42=2\times3\times7 。 42是第三个15边形数。 它和三角形数类似,但基于的是正15边形。 42是超级多重完全数:除数之和的除数之和(包括42),这样重复6次之后的数字等于自己。 在一段.

Melbourne bus crash School children suffer "life changing" injuries

Bus crash on I81 near Harrisburg, Pennsylvania 3 dead, dozens hurt

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School bus crash on Idaho leaves 11 people injured; seven critically

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Melbourne bus crash School children suffer "life changing" injuries

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