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()。
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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
压力表是指示压力容器内介质压力的仪表,是压力容器的重要安全装置。液柱式压力计一般用于测量高压压力。
A. 正确
B. 错误