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建筑物的阴角容易受到磨损

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We are only interested in events that relate directly ______ the murder.

Nobody had expected that ____________________ （这样的悲剧会发生在他身上). （happen to)

A man can finish his shopping for clothes quickly if everything goes well.

若开环系统是稳定的，即位于S平面的右半部的开环极点数p=0，则闭环系统稳定的充要条件是：当ω由-∞变到+∞时，开环频率特性包围（-1,j0)点0圈。