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问题 多项选择题

下列防雷设备安装描述正确的有（）。

A.装设多支避雷针时，两针之间距离不宜大于50m

B.单支避雷针的保护范围可按45°保护角确定

C.装设多支避雷针时，两针之间距离不宜大于30m

D.屋顶上单支避雷针的保护范围可按60°保护角确定

答案

参考答案：C, D

单项选择题 A1型题

黑膏药的工艺流程是（）

A.炼油→下丹成膏→药料提取→去"火毒"→摊涂

B.药料提取→去"火毒"→炼油→下丹成膏→摊涂

C.药料提取→炼油→下丹成膏→去"火毒"→摊涂

D.药料提取→炼油→去"火毒"→下丹成膏→摊涂

E.药料提取→炼油一摊涂→下丹成膏→去"火毒"
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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.

（2）是（）

A.visible

B.reliable

C.secure

D.robust
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