会计核算软件在某月进行月末结账以后，系统应能自动控制( )。

A．不得再录入当月凭证
B．不得录入下月凭证
C．不得再进行凭证查询
D．不得再进行账簿打印

WAP uses (71) , which includes the Handheld Device Markup Language (HDML) developed by Phone.com. WML can also trace its roots to eXtensible Markup Language (XML). A markup language is a way of adding information to your (72) that tells the device receiving the content what to do with it. The best known markup language is Hypertext Markup Language. (73) HTML, WML is considered a meta language. Basically, this means that in addition to providing predefined (74) , WML lets you design your own markup language (75) . WAP also allows the use of standard Internet protocols such as UDP, IP and XML.

（72）处填（）。

A．packet

B．content

C．text

D．applets