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问题 选择题

（11·珠海）已知一组数据：4，－1，5，9，7，6，7，则这组数据的极差是

A．10

B．9

C．8

D．7

答案

答案：A

分析：根据极差的定义用一组数据中的最大值减去最小值即可求得．

解答：解：由题意可知，极差为9-（-1）=10．

故选A．

单项选择题

A management domain typically contains a large amount of management information. Each individual item of（1）information is an instance of a managed object type. The definition of arelated set of managed （2）types is contained in a Management Information Base(MIB) module. Many such MIB modules are defined. For each managed object type it describes, a MIB（3）defines not only the semantics and syntax of that managed object type, but also the method ofidentifying an individual instance so that multiple （4） of the same managed object type can bedistinguished. Typically, there are instances of each managed object（5） within a managementdomain.

（5）是（）

A.device

B.state

C.type

D.packet
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多项选择题

动物为集群生活所付出的代价有哪些？（）

A.竞争随群体大小的增加而增加

B.增加疾病和寄生物传播的机会

C.容易发生近亲交配

D.被捕食的机会增大
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