建设工程项目投资决策完成后，有效控制工程造价的关键在于()。A.审核施工图预算 B.

已知某混合液由C₆H₆、C₈H₈、C₂H₄O、C₂H₆O₂等四种物质组成，经测定其中含碳的质量分数为a%，则含氧的质量分数为：______．

室内隐蔽钢结构，高层全钢结构及多层厂房钢结构，当规定其耐火极限在( )h以上时，应选用厚涂型钢结构防火涂料。

A．0.5

B．1

C．1.5

D．2.5

DOM is a platform-and language- (21) 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 (22) . DOM is a (23) -based AP1 to documents, which requires the whole document to be represented in (24) while processing it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large (25) documents that do not fit info the memory available for processing.

A．XML

B．HTML

C．script

D．web

创伤、手术和麻醉时的应激是机体所产生的一种（）

A.特异性全身反应

B.非特异性防御反应

C.损害性全身反应

D.代偿性全身反应

E.防御性全身反应

在E-R图中，矩形表示______。