下锚补偿坠砣安装时,坠砣表面光洁平整、坠砣串排列整齐,相邻坠砣其缺口相互错开()。
A、30°
B、45°
C、90°
D、180°
参考答案:D
一个人站在平面镜前,当他走近镜子时,他在镜子中的像( )
A.变大,像与人的距离变大
B.变大,像与人的距离变小
C.大小不变,像与人的距离变大
D.大小不变,像与人的距离变小
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.
66()
A.text
B.Image
C.Page
D.graphic