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问题 单项选择题

射线透过物质时，电子对生成效应只能在入射射线光子能量达到（）时才能发生。

A.1.02MeV

B.大于1.02MeV

C.1020keV

D.小于1020keV

答案

参考答案：B

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 suchsystems in terms of a ______ of structural organization. More specifically, each ______ describes a systemcategory that encompasses: (1) a set of components (e.g., a database, computational modules) that perform afunction required by a system, (2) a set of ______ that enable "communication, coordination andcooperation" among components, (3)______ that define how components can be integrated to form thesystem, and (4) semantic models that enable a designer to understand the overall properties of a system byanalyzing the known ______ of its constituent parts.

A. style B. phase C. charter D. schedule
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单项选择题 A1型题

引起糖尿病代谢紊乱的主要是（）

A.胰岛素拮抗激素增多

B.胰岛素生物活性或效应绝对或相对不足

C.胰岛素受体数目、亲和力降低

D.高胰岛素血症和胰岛素抵抗

E.葡萄糖耐量降低
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