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问题 单项选择题

某医生欲比较学龄前期与学龄期儿童铅中毒的情况，调查结果如下表，下列说法最合适的是（）。

A．学龄期儿童铅中毒的比例小于50%，不能认为学龄期儿童更容易铅中毒

B．由于未设对照组，不能认为学龄期儿童更容易铅中毒

C．本资料应作卡方检验后再作结论

D．学龄期儿童铅中毒的比例远高于学龄前期，无需做统计检验

E．本资料应作t检验后再作结论

答案

参考答案：C

单项选择题

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

DOM is a platform- and language- （） API that allows programs and scripts to dynamically access and update the content.

A．specific

B．neutral

C．contained

D．related
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单项选择题

在影响供给的其他因素不变的条件下，供给量在同一条供给曲线上随商品本身价格变化而发生同方向变化称为( )。

A．供给量的变化

B．影响供给量的因素变化

C．供给的变化

D．影响供给的因素变化
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