【简答题】听下面一段材料,回答第1-3题。 1. How does the woman keep in touch with her family? A. By letter. B. By computer. C. By telephone. 2. What does the man advise the woman to do? A. Talk with people online. B. Learn h...
【判断题】云南的立体气候和四季充足的阳光,使被称为植物王国的云南四季鲜花常开。
【单选题】在我国被称为"动物王国" 与 “植物王国”,是我国最重要的动物和植物基因库。
【单选题】公开招标亦称无限竞争性招标,是指招标人以( )的方式邀请不特定的法人或者其他组织投标。
【单选题】以航运公司为主体,签发联运提单,与航线两端的内陆运输部门合作,开展联运业务的国际多式联运的形式为( )。
【多选题】Which of the following are disadvantages of systematic sampling? ( )
A.
The sample chosen might be biased.
B.
Some samples have a zero chance of being selected so the sampling method is not completely random.
C.
Prior knowledge of each item in the population is required.