根据《中华人民共和国证券法》规定，如下属于我国证券交易所的职责有（）。 A.为组织公

具有蛋白质四级结构的蛋白质分子，在一级结构分析时发现（）

A.具有一个以上N端和C端

B.只有一个N端和C端

C.具有一个N端和几个C端

D.具有一个C端和几个N端

E.一定有二硫键存在

细菌性肝脓肿的主要感染途径不包括()

A．胆道

B．肠系膜上静脉

C．肝总动脉

D．下腔静脉

E．直接蔓延

The revision of the Uniform Customs and Practice for Documentary Credits is the sixth revision of the rules．It is the fruit of more than three years of work by (1) ．UCP 600 applies to any (2) when the text of the credit expressly indicates that it is subject to these rules．They are binding on all parties thereto unless expressly modified or excluded by the credit． (3) means the bank that advises the credit at the request of the issuing bank． (4) means the bank that issues a credit at the request of an applicant or on its own behalf．Article 14 describes the standard for examination of documents．Under UCP 600，the (5) must be made out in the same currency as the L/C．B/L may now allow transshipment，provided that the entire carriage is coved by one and the same bill of lading．

A．documentary bill

B．commercial invoice

C．commercial draft

D．pro forma invoice

关于防火墙的功能，以下哪一种描述是错误的( )。

A．防火墙可以检查进出内部网的通信量

B．防火墙可以使用应用网关技术在应用层上建立协议过滤和转发功能

C．防火墙可以使用过滤技术在网络层对数据包进行选择

D．防火墙可以阻止来自内部的威胁和攻击