对厚煤层采用分层与放顶煤相结合的采煤方法，既可控制导水裂缝带的发育高度，又可降低生产成本。
A coal mining method with a combination of a slicing and caving, a double benefit in control of water conducted crack zone development and in reduction of coal production cost can be obtained.
在这一背景下，本文研究了带末端攻击角度约束的制导方法设计和制导控制一体化方法设计问题。
In this paper, the missile guidance with terminal impact Angle constraint and integrated guidance and control design for missile with terminal impact constraint were researched.
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