液压泥炮应防止泥缸间隙大，造成跑泥，液压油温不许超过（）。
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Which of these is a correct description of Stateful Switchover？（）
A. It will only become active after a software failure
B. It will only become active after a hardware failure
C. It requires that Cisco N3F· be enabled in order to work successfully
D. It synchronizes the MAC·， FIB·， and adjacency tables between Active and Standby Route Processor
掌握学科基本结构的教学原则是动机原则、（）原则、程序原则和强化原则。
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