For a rapid and sheltered goal entering low or nearby air, the paper shows with strict shooting principle that there exist 3 kinds of shooting opportunities possessed by archibald alone, which illustrates that archibald cannot be replaced.

• 对突入低近空的快捷或遮蔽目标 ,本文以严谨的射击学原理证明 :存在着三种只对高炮才有的射击时机 ,阐明了高炮的不可替代性 ;