What are three characteristics of NSC technology? （）(Choose three.)

A

NSC operates at the file level.

B

NSC operates at the byte level.

C

NSC uses hard drives to store longer patterns.

D

NSC retains learned patterns for a longer time.

E

NSC is available only on platforms with dual hard drives.

What are two types of WebView monitoring statistics on the WX/WXC platforms?（） (Choose two.)

LAN

QoS

traffic

IPSec

6阶有限群的任何子群一定不是（　　）阶。

A、2

B、3

C、4

D、6

放置元器件的说法中，正确的是（）。

A、元件最好对齐到较大的网格上，以利美观

B、贴片元件所在位置的反面可以放置另一个贴片元件

C、穿孔元件所在位置的反面可以放置另一个贴片元件

D、无论什么元件，在PCB上放置越紧密越好

Which two conditions will cause switch-to-wire to occur? （）(Choose two.)

loss of power

QoS congestion

software failure occured

WX device exceeded its license speed

traffic does not match application definiton

在自然数集N上，下面哪种运算是可结合的？（　　）。

A、a*b＝a－b

B、a*b＝max{a，b}

C、a*b＝a＋2b

D、a*b＝｜a－b｜