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问题 选择题

人体内终生具有造血功能的红骨髓存在于

A．骨髓腔

B．椎管内

C．骨密质内

D．骨松质内

答案

答案：D

解：人体内的骨髓有两种，一种是红骨髓，另一种是黄骨髓．幼年时人的骨髓腔里是红骨髓，具有造血功能．成年后骨髓腔里的红骨髓转变成了黄骨髓失去造血功能．但当人体大量失血时，骨髓腔里的黄骨髓还可以转化为红骨髓，恢复造血的功能．在人的骨松质里有红骨髓，终生具有造血功能．骨质包括骨松质和骨密质．

故选：D

单项选择题

下列哪项对“优质”一词做了最好的定义（）

A.98％通过测试

B.符合要求

C.在行业中最优

D.出具ISO认证的文件材料
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单项选择题

Representations of software architecture are an enabler for communication between all parties (stakeholders) interested in the development of a computer-based system. An architectural style defines as a family of such systems in terms of a ① of structural organization. More specifically, each ② describes a system category that encompasses: (1) a set of components (e.g., a database, computational modules) that perform a function required by a system, (2) a set of ③ that enable "communication, coordination and cooperation" among components, (3) ④ that define how components can be integrated to form the system, and (4) semantic models that enable a designer to understand the overall properties of a system by analyzing the known ⑤of its constituent parts.

②是（）

A.style

B.phase

C.charter

D.schedule
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