()是将正在燃烧的物质和周围未燃烧的可燃物质隔离或移开,中断可燃物质的供给,使燃烧因缺少可燃物而停止。
A. 冷却灭火法
B. 隔离灭火法
C. 窒息灭火法
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示波器中由于Y轴信号的减小而引起波形不稳定,这时可适当加大();如果是因Y轴信号加大而引起波形不稳定,可适当减小()。
Which two features prevent routing loops between the OSPF sites of a customer when the sites aremultihomed or a backdoor link is used between the sites? ()
A. sham link
B. down bit
C. virtual link
D. Site of Origin
E. domain tag