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问题 单项选择题

宏是由一个或多个______组成的集合。

A．命令

B．操作

C．对象

D．表达式

答案

参考答案：B

解析：[知识点] 宏/宏的基本概念[评析] 宏是一个或多个操作组成的集合。

单项选择题

在水喷雾灭火系统中，管网冲洗宜设临时专用排水管道，其排放管道的截面面积不小于被冲洗管道截面面积的（）。

A．30％ 

B．50％ 

C．60％ 

D．80％
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单项选择题

DOM is a platform-and language- (1) API that allows programs and scripts to dynamically access and update the content, structure and style of WWW documents (currently, definitions for HTML and XML documents are part of the specification). The document can be further processed and the results of that processing can be incorporated back into the presented (2) DOM is a (3) -based API to documents, which requires the whole document to be represented in (4) while processing it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large (5) documents that do not fit into the memory available for processing.

(2)

A．text

B．image

C．page

D．graphic
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