材料的极限延伸率不能满足一次成形的要求，则说明不能（）压成，必须增加工序逐步压出。

痣细胞仅位于表皮底层，有潜在恶变可能的痣是（）

A．交界痣 

B．皮内痣 

C．混合痣 

D．皮脂腺痣 

E．鲜红癍痣

无氧化或少氧化加热的目的是（）。

A、节约燃料

B、防止冒黑烟

C、保护被加热金属

220～500kV母线保护的配置原则是( )。

A．本侧母线故障在对侧线路后备保护作用范围内时，可不装设母线保护，否则就装设一套母线保护；
B．应装设能快速有选择地切除故障的母线保护，对1个半断路器接线，每组母线宜装设两套母线保护；
C．当本侧的变压器后备保护能实现对母线的保护时，可不装置母线保护，否则应装设一套母线保护；
D．对于1个半断路器接线每组母线应装设一套母线保护。

正常冷却的步骤有哪些？

DOM is a platform- and language- (65) 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 (66) . DOM is a (67) -based API to documents, which requires the whole document to be represented in (68) while processing it. A simpler alternative to DOM is the event-based SAX, which can be used to process very large (69) documents that do not fit into the memory available for processing.

67（）

A.table 

B.tree 

C.control 

D.event