除哪一项外下列各项均可出现肝浊音界扩大A．肝炎 B．肝癌 C．肝包虫病 D．晚期肝炎

Basically, a (71) is a standalone process or a set of integrated processes that runs on a router or server to control the flow of (72) application traffic (73) through it. Typically, firewalls are (74) on the entry point to a public network such as the Internet. They could be considered traffic cops. The firewall’ s (75) is to ensure that all communication between an organization’s network and the Internet conform to the organization’s security policies.

71（）

A．router

B．client

C．firewall

D．switch

《建设工程施工合同（示范文本）》（GF-1999）规定，工程开工前，（）应当为建设工程办理保险，并支付保费。

A．发包人 

B．承包人 

C．发包人与承包人 

D．工程建设各方

南北宗论中“北宗”的宗主是（）。

试述肠毒素性肠炎的临床表现。

举高消防车长期贮存时，应每隔（）月进行一次空运转。

A.1个

B.2个

C.3个

D.4个