If you settle on a sequence just four "knocks" long, a hacker trying to guess it by brute force would have to test about 13 million million million possible sequences (that's 13 followed by 18 zeros).
如果敲门序列只包含四次“敲门”，黑客要想通过强力攻击猜出序列，就必须测试大约13,000,000,000,000,000,000个序列(13后面18个零)。
Based on the transfer function of equivalent force control system and the numerical simulation, this paper primarily studies the zeros problem which appears in RST with EFCM.
本文基于等效力控制系统的传递函数和数值模拟，主要研究了实时子结构试验等效力控制方法中的零点问题。
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