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问题 选择题

正方形具有而菱形不一定具有的性质是（　　）

A．对角线互相垂直

B．对角线平分一组对角

C．对角线相等

D．对角线互相平分

答案

正方形具有而菱形不一定具有的性质是：①正方形的对角线相等，而菱形不一定对角线相等，②正方形的四个角是直角，而菱形的四个角不一定是直角，

故选C．

单项选择题

The software architecture of a program or computing system is the structure or structures of the system, which comprise software （1）, the externally （2）properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a （3） that enables a software engineer to: analyze the （4）of the design in meeting its stated requirements, consider architectural alternatives at a stage when making design changes is still relatively easy, and reduce the（5） associated with the construction of the software.

（5）是（）

A.quality

B.budget

C.schedules

D.risks
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单项选择题

折射仪在同一刻面与折射议半球接触的情况下：（）.

A.可以测出最大双折射率

B.不可能测出最大的双折射率

C.可能测到一个折射率
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