Which two conditions will cause switch-to-wire to occur? （）(Choose two.)
Aloss of power
BQoS congestion
Csoftware failure occured
DWX device exceeded its license speed
Etraffic does not match application definiton
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通过哪些方式，不能为封装库添加已有的封装（）。
A、从PCB文档中将封装复制粘贴到库中
B、从另一个PCB封装库中将封装复制粘贴到库中
C、从原理图文档中通过复制原理图符号将其链接的PCB封装粘贴到库中
D、在库内复制粘贴
Given that the current directory is empty， and that the user has read and write privileges to the currentdirectory， and the following： Which statement is true？（）
A、 Compilation fails.
B、 Nothing is added to the file system.
C、 Only a new file is created on the file system.
D、 Only a new directory is created on the file system.
E、 Both a new file and a new directory are created on the file system.
6阶有限群的任何子群一定不是（ ）阶。
A、2
B、3
C、4
D、6
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｜
[AddJump]：增加跳线。同时按下J键和Ctrl键也可以实现同样功能。
A、对
B、错
