Which of the following is not true about a subheading?

What does the prefix "sub" in words like subheading, subtitles and sub-zero mean A: elow B: efore C: afte

.A topic can often be found through . A: the title B: the subheading C: the subject in the first sentence D: the repeated words or phrases in the text

下面不可以缩小检索结果范围的是() A: 会用AND B: 善用filter C: 巧用majorMeSH、Subheading D: 扩展下位词

Read the text and choose the best subheading for the beginning of the text. A: 1. The advertising industry is going through a crisis period—sales are down and times are hard. B: 2. The traditional media are finally attracting a new younger audience and more advertisers as a result. C: 3. More people are rejecting traditional sales messages, presenting the ad industry with big challenges.

关于副主题词的描述，正确的是（） A: 它对应的英文是subheading或者qualifier. B: 副主题词没有独立检索意义。 C: 使用副主题词的目的是提高对文献主题标引及检索的专指度。 D: 目前有83个副主题词。