单项选择题

（）operate by distributing a workload evenly over multiple back end nodes. Typically the cluster will be configured with multiple redundant load-balancing front ends.

A．High-availability clusters
B．Load-balancing clusters
C．Grid computing
D．Cloud Computing

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单项选择题
In software engineering and systems engineering,（）is a description of a system's behavior as it responds to a request that originates from outside of that system.

A．black box
B．business rule
C．use case
D．traceability matrix
单项选择题
若某小型信息系统开发团队由4人组成，则其沟通渠道数为（）。

A．12
B．10
C．8
D．6
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