其实CBU类包括MK20现实中都不适宜做反跑道炸弹的~
专门的反跑道炸弹如BLU-107从500ft AGL投放后立即打开降落伞, 等弹体因为阻力和地面垂直后火箭发动机启动, 弹头加速钻入跑道里后爆炸.......
The rocket can penetrate up to 40 centimeters of concrete, and creates a crater 5 meters deep and approximately 16 meters in diameter. http://en.wikipedia.org/wiki/BLU-107_Durandal
当然现在这个已经退役了, 反跑道全上GPS炸弹了..