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问题 单项选择题

利用细菌和真菌等微生物、蚯蚓等动物以及水生藻类、陆生植物，甚至酶及分泌物等的代谢活性降解、减轻有机污染物的毒性，改变重金属的活性或在环境中结合态。（）

A.微生物修复

B.植物修复

C.动物修复

D.酶学修复

答案

参考答案：A

单项选择题

BGP is an inter-autonomous system routing protocol; it is designed to be used between multiple autonomous ( ) . BGP assumes that routing within an autonomous system is done by an intra-autonomous system routing protocol.BGP does not make any assumptions about intra-autonomous system （） protocols employed by the various autonomous systems. Specifically， BGP does not require all autonomous systems to run the same intra-autonomous system routing protocol.

BGP is a real inter-autonomous system routing protocol. It imposes no constraints on the underlying Internet topology. The information exchanged via BGP is sufficient to construct a graph of autonomous systems connectivity from which routing loops may be pruned and some routing ( ) decisions at the autonomous system level may be enforced.

The key feature of the protocol is the notion of Path Attributes. This feature provides BGP with flexibility and expandability. Path （） are partitioned into well-known and optional. The provision for optional attributes allows experimentation that may involve a group of BGP （） without affecting the rest of the Internet.   New optional attributes can be added to the protocol in much the same fashion as new options are added to the Telnet protocol， for instance.

Path （） are partitioned into well-known and optional.

A．states

B．searches 

C．attributes   

D．researches
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问答题 计算题

某厂一级除盐周期制水量1320t，阴床再生用28%（密度1.31）NaOH600L，已知阴床进水平均酸度2.26mmol/L，残留CO26.4mg/L，入口水SiO2为20mg/L，求本周期碱耗是多少？
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