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问题 多项选择题

下列描述正确的有（）。

A.在实际的三相五线制供电系统中，N线电流不等于零

B.在三相五线制供电系统中，PE线电流等于零

C.按规定，一般通信机房零对地电压不大于5V

答案

参考答案：A, B, C

问答题

社会主义新农村建设的总体要求(目标)是什么
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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.

(4)

A．document

B．processor

C．disc

D．memory
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