【单选题】动态数列中各项指标数值之和有独立经济意义的是( )。
【单选题】在电阻、电感串联正弦交流电路中,功率因数 cosΦ=( )
【多选题】Both bridges are switches are being used throughout the Ezonexam LAN. Which of the following statements are true regarding bridges and switches in this network? (Choose 3)
A.
Switches are primarily software based while bridges are hardware based.
B.
Switches usually have a higher number of ports than most bridges.
C.
Bridges are frequently faster than switches.
D.
Bridges define broadcast domains while switches define collision domains.
E.
Both bridges and switches forward Layer 2 broadcasts.
F.
Both bridges and switches make forwarding decisions based on Layer 2 addresses.
【单选题】有程序段Dim a%(10),k%: For k=1 to 10 : a(k)=sqr(k) : Next k : Print a(k), 程序运行结果为( )。
【简答题】有如下程序段 Dim a(4) As Integer,b(4) As Integer For k=0 to 2 a(k+1)=k*2 b(3-k)=a(k-1) Next k Print b(k) 执行程序段的结果是 。
【判断题】时间数列中各项指标数值可以相加的是时期数列。
【单选题】编写以下程序段: DIM I, J, K, A A=0 FOR I = 1 TO 3 FOR J = 1 TO I FOR K=-J TO 3 A=A+1 NEXT K NEXT J NEXT I 执行上面的三重循环后,变量A的值为( )。
【简答题】按主拱圈截面形式分拱桥有 、 、 和箱形拱桥。