题目内容

用同一种限制酶切割载体和目的基因后进行连接,连接产物会含大量自身环化载体,采用下列哪种酶处理,可防止载体自身环化()

A. 核酸内切酶
B. 核苷酸激酶
C. 核酸外切酶
D. 末端转移酶
E. 碱性磷酸酶

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Your network consists of two subnets named Subnet1 and Subnet2. You have a server named Server1 that runs Windows Sever 2003 Service Pack 2 (SP2). Server1 is located on Subnet1. Users from Subnet1 report poor performance when they connect to Server1. Users from Subnet2 report that they are unable to connect to Server1. You monitor both network segments and discover a large number of NetBIOS broadcasts on both network segments.You need to reduce the number of broadcasts on the network. What should you deploy?()

A. a DHCP Relay Agent
B. a WINS server
Connection Point Services(CPS)
D. Simple TCP/IP Services on all computer

具有活血、行气功效的药物是()。

A. 桃仁
B. 红花
C. 丹参
D. 川芎
E. 五灵脂

预制板的支撑方式有()。

A. 直板式和曲板式
B. 板式和梁式
C. 梁式和曲梁式
D. 板式和梁板式

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