【单选题】导游语言除具有思想性、知识性、趣味性、科学性、准确性之外,还应具有( )。
【单选题】The machinery had been wrecked so efficiently that the police were sure it was a case of___.
【简答题】In _1_ , Assar Gabrielsson, a _2_ manager and Gustav Larson, an_3_ , had the _4_ to build _5_ that people could drive on Sweden's rough _6_ and during Sweden's _7_ winters._8_ years later, the first V...
【简答题】约占乳蛋白总量的 80 %,是牛乳中的主要蛋白质。
【单选题】以下哪个说法是错误的( )。
A.
一个序列显示出显著的短期相关性,就一定不是白噪声序列
C.
由于观察值序列的有限性,导致纯随机序列的样本自相关系数不会绝对为零
D.
如果一个序列的残差不是白噪声序列,说明模型提取信息充分
【简答题】滚动轴承的主要结构形式有哪几种 ,各有 什么特点?
【单选题】The machinery had been wrecked so efficiently that police were sure it was a case of______ .
【单选题】在场地平整的方格图上,各方格角点的施工高度为该角点的( )。