内因子由（）
A、主细胞分泌
B、壁细胞分泌
C、浆细胞分泌
D、G细胞分泌
E、黏液细胞分泌
实达交换机有哪几种VLAN的工作模式？（）
APort VLAN
BTag VLAN
CMAC VLAN
DUSER VLAN
Which two statements are true when configuring a domain-id? （）
AThe default OSPF domain-id is 127.0.0.1.
BIn most cases, a domain-id must be configured.
CIn most cases, you do not need to configure a domain-id.
DFor a layer 3 VPN connecting multiple OSPF domains, configuring a domain-id can help control LSA translations.
Information theory is related to the quantification of information. This was developed by Claude E. Shannon to who found fundamental limits on ( ) operations such as compressing data and on reliably storing and communicating data.
A、signal
B、data
C、information
D、signal processing
将x+y*z中的“+”用成员函数重载，“*”用友元函数重载应写为（ ）。
A、operator+（operator*（y，z））
B、x.operator+（operator*（y，z））
C、x.operator+（x*（y，z））
D、x+（operator*（y，z））
要学会变着花样的复习，其中包括（）。
A、复习要集中
B、复习要及时
C、要有适当的过度学习
D、分散复习优于集中复习