【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.
【单选题】The two fishermen saw ___________ in the sky while they were fishing by a river.
【单选题】如果单片机的晶振是12MHz,当定时计数器做定时功能时,定时器内部计数器,每计一个数的时间是( )
【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】Two fishermen saw ___in the sky while they were fishing by a lake.
【单选题】刘徽撰《九章算术注》,最大的贡献是创立了()
【单选题】适航规章要求,化学氧气发生器应至少保证多长时间的供氧:
【简答题】适航规章要求,化学氧气发生器应至少保证多长时间的供氧() A12分钟 B30分钟 C60分钟 D90分钟
【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。