【简答题】有 4 个不同的实验室制作同一型号的纸张 , 为比较各实验室生产纸张的光滑度 , 测量了每个实验室生产的 8 种张纸 , 得其光滑度如表 所示 . 假设上述数据服从方差分析模型 . 试在显著性水平α = 0.05 下 , 检验各个实验室生产的纸张的光滑度是否有显著差异 . X<-c(38.7,41.5,43.8,44.5,45.5,46.0,47.7,58.0, 39.2,39.3,39.7,41...
【单选题】恩格勒系统是假花学说的代表,认为现代被子植物是以下哪些植物类群演变而来
【单选题】企业进行某种活动,目的是为了宣传介绍其产品的优点,说服目标顾客来购买其产品,具体包括广告、销售促进、宣传和人员推销等,这种活动称为
【简答题】有4个不同的实验室制作同一型号的纸张, 为比较各实验室生产纸张的光滑度, 测量了每个实验室生产的8种张纸, 得其光滑度如下表所示. 假设上述数据服从方差分析模型. 试在显著性水平alpha= 0.05下, 检验各个实验室生产的纸张的光滑度是否有显著差异.
【简答题】It is sunny and cloudless outside. It is suitable for a picnic. It is sunny and cloudless outside, _____________________________. 2. The Internet is a good way to get information. It helps students le...
【简答题】恩格勒系统是恩格勒和帕兰特在(《》)一书中发表的植物分类学史上第一个比较完整的自然分类系统。
【判断题】证券业从业人员和证券业管理人员不得直接或间接持有、买卖股票。( )
【单选题】----Why did you get so angry with Tom then? ----I had been waiting for _____ seemed for ages before he finally turned up.
【判断题】广告、销售促进和人员推销在建立顾客知晓方面,比公共宣传的作用显著。
【单选题】After I ______ for an hour, I realized that he was not coming. A. was waiting B. had been waiting C. waited D. have waited