December and May

Methods From December 2003 to May 2004, a cross-sectional study was performed to interview the socio-demographic characteristics, sexual behaviors and condom use with spouses and non-steady sex partners among HIV positive adults.

方法2003年12月~2004年5月采用横断面研究方法调查HIV感染者的社会人口学特征，婚内、婚外性行为和安全套使用情况。

Similarity analysis shows that March and April 2009, May and June 2008, as well as October and December 2008 have similar eukaryotic species respectively.

相似性分析表明，09年3和4月、08年5和6月份以及2008年10和12月份养殖海区真核微生物种类各自相近。

By way of analysing the data of oceanic survey for December 16-23 in the year 1958 and May 15-23 in the year 1959, a statistical and diagrammatic investigation on the oceanophysics of the Bay of Dairen is made.

本文根据1958年12月1623日和1959年5月1523日的调查资料，应用统计和图介的方法来探讨大连湾海洋物理性质。

Closed Thanksgiving Day, December 25, January 1, and the first Monday in May ．

感恩节、圣诞节、元旦和5月首周一不营业。

The centralized adult emergence of Chironomid larvae appears twice a year and normally appears in April to May and November to December.

摇蚊幼虫集中羽化的时间有两次，主要为春末夏初的4-5月和秋末冬初的11-12月。