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问题 选择题

如果两个直角三角形的两条直角边对应相等，那么这两个直角三角形全等的依据是（　　）

A．SSS

B．AAS

C．SAS

D．HL

答案

两边及夹角对应相等的两个三角形全等，这为“边角边”定理，简写成“SAS“．

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______, the externally ______ properties of those components, and the relationships between them. The architecture is not the operational software. Rather, it is a ______ that enables a so, ware engineer to: analyze the ______ 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 ______ associated with the construction of the software.

A．changeability
B．effectiveness
C．testability
D．functionality
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单项选择题 B型题

简单低共烷混合物中药物存在形式是：（）

A．分子状态

B．胶态

C．微晶

D．无定型

E．物理态
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