【判断题】C0为通用计数器,只能进行加计数,当计数的当前值=设定值后,即使再有计数输入信号,计数器当前值保持为设定值不变。而C200为双向计数器,当为加计数工作时,当计数的当前值=设定值后,如再有计数输入信号,计数器当前值仍继续增加。
【多选题】Regarding an IPsec security association (SA), which two statements are true?()
A.
IKE SA is bidirectional.
B.
IPsec SA is bidirectional.
C.
IKE SA is established during phase 2 negotiations.
D.
IPsec SA is established during phase 2 negotiations.
【简答题】Norwegian farmers and fishermen have an important influence because _________.
【简答题】Once upon a time, there were two fishermen who were good at fishing. One day they went to a lake to . One of them fishing alone by himself the other was an outgoing person who loved to friends with di...
【单选题】刘徽撰《九章算术注》,最大的贡献是创立了()
【判断题】当对单片机外部信号进行计数时,定时计数器作为计数器用。
【简答题】刘徽撰《九章算术注》,最大的贡献是创立了() A.“图验法” B.“今有术” C.“齐同术” D.割圆术
【单选题】刘徽撰《九章算术注》,最大的贡献是创立了()