As a key precondition of space military action and joint operations, space information acquisition needs advanced radio techniques.
作为空间军事行动及联合作战的基础和关键前提，空间信息获取离不开先进的无线电技术。
Group communication is its important communication method, in which a feasible and effective group key management mechanism is the key precondition for security.
组通信是其重要的通信方式之一，可行和有效的组密钥管理机制是保障组通信安全的关键前提。
Fingerprint image binarization, as one key step of fingerprint image preprocessing, is the precondition of fingerprint image thinning.
指纹图像二值化是指纹细化处理的前提，是指纹识别预处理的一个重要部分。
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