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问题 多项选择题

防伪税控系统，认证子系统可以完成以下哪些操作？（）

A.抵扣联认证

B.存根联补录

C.空白作废发票存根联补录

D.存根联清单补录

E.增值税普通发票验签

F.认证后失控发票查询

答案

参考答案：A, B, C, D, E, F

单项选择题

The de facto standard Application Program Interface (API) for TCP/IP applications is the “sockets” interface. Although this API was developed for （71） in the early 1960s it has also been implemented on a wide variety of no-Unix systems. TCP/IP （72） Written using the sockets API have in the past enjoyed a high degree of portability and we would like the same （73） with IPv6 applications. But changes are required to the sockets API to support IPv6 and this memo describes these changes. These include a new socket address structure to carry IPv6 （74） ,new address conversion functions, and some new socket options. These extensions are designed to provide access to the basic IPv6 features requited by TCP and UDP applications, including multicasting, while introducing a minimums of change into the system and providing complete （75） for existing IPv4 applications.

A．availability 

B．compatibility 

C．capability 

D．reliability
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单项选择题

世界宪法发展史上第一部成文宪法是

A．英国《自由大 * * 》

B．美国1787年宪法

C．法国1791年宪法

D．苏俄1918年宪法
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