搜题请搜索小程序“爱下问搜题”
问题 单项选择题

电磁场的确切概念是

A．电场产生磁场
B．磁场产生电场
C．电场加磁场
D．变化的电场与变化的磁场的不可分割的联系，循环往复，向周围不断扩大的空间
E．变化的电场与变化的磁场相平衡所占据的空间

答案

参考答案：D

单项选择题 B型题

最早明确提出保守医密和反对堕胎这两条医德规范的是（）

A.《黄帝内经》

B.宋国宾《医业伦理学》

C.孙思邈《备急千金要方》

D.希波克拉底《希波克拉底誓言》

E.帕茨瓦尔《医学伦理学》
查看答案
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 software 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
查看答案