【判断题】____PLC一般常采用梯形图进行编程,梯形图中的接点和线圈均为软触表和软线圈。
【单选题】rega=4’b0111 ,则rega=~rega, 此时rega的值是:
【单选题】执行语句“rega=' b1010; rega=~ rega;”后,rega的值是( )。
【判断题】PLC一般常采用梯形图进行编程,梯形图中的接点和线圈均为软触点和软线圈。
【多选题】ICMP is often used in troubleshooting and verifying network. What statements are true regarding ICMP packets? (Choose two)
A.
They acknowledge receipt of TCP segments.
B.
They guarantee datagram delivery.
C.
They can provide hosts with information about network problems.
D.
They are encapsulated within IP datagrams.
E.
They are encapsulated within UDP datagrams.
F.
They are encapsulated within TCP datagrams.
【单选题】The Norman Conquest started a continual flow of French words into English. _________ of them are still in use today.
【简答题】解析 2 个过程语句分别能产生时序逻辑还是组合逻辑电路。 ( 1 ) always (*) begain if (a&b) rega=c; else rega=0; end ( 2 ) always (*) begain if (a&b) rega=c; y=rega; end