【多选题】下列数值中,属于描述离散趋势的统计量是( )。
【单选题】有的人群长期素食,却很少患夜盲症。这是因为
A.
有些植物性食物中含有胡萝卜素,在人体内可以转变成维生素A
【单选题】下列数值中,属于描述离散趋势的统计量是( )。
【判断题】当试图 “平衡价格”时,第一个要进行谈判的供应商应该是最可能重新考虑定价的供应商。
【单选题】( )is the usual form for small shops and businesses that provide services such as beauticians, hairdressers, photographers, gardeners and so on.
【简答题】However one method could be to place some form of contact pads on the outside of the skin, which however gives additional problems in the form of fitting, risk of infections, reliability and so on.