皮皮学，免费搜题
登录
搜题
【多选题】
下列表述正确的是()A.
样本平均数是相应总体平均数的无偏估计值
B.
数据资料呈偏态分布时，中位数的代表性优于算数平均数
C.
用几何平均数比用算数平均数更能代表作物生产的平均增长率水平
D.
表示某一过程不同阶段的平均水平时，调和平均数优于算数平均数
E.
对于同一资料来说，算数平均数≥几何平均数≥调和平均数
拍照语音搜题，微信中搜索"皮皮学"使用
参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Which is the most popular form of all the literary art during the Victorian period?
A.
drama
B.
prose
C.
fiction
D.
poetry
【单选题】使用 722 型分光光度计时, 正确的调节方法是: ( )
A.
盖上样品室盖子调“0”和“100”
B.
盖上样品室盖子调“0”; 打开盖子调“100”
C.
打开样品室盖子调“0”和“100”
D.
打开样品室盖子调“0”; 盖上盖子调“100”
【单选题】What elements does the communication involve?
A.
sender
B.
receiver
C.
message
D.
all of the above
【简答题】v Video: Zootopia_1_2 v Thinking: v 1. Why did the negotiation of buying popsicles succeed? What techniques or elements did the rabbit use? v 2. Why did the rabbit fail to negotiate with the fox after...
【单选题】What elements does an optimized website need to introduce?
A.
Proper keywords
B.
proper meta-tags
C.
proper title-tags
D.
all of the above
【单选题】What elements does a phrase contain?
A.
Head, determiner and complement.
B.
Head, specifier and complement.
C.
Head, specifier and complementizer.
D.
Head, determiner and complementizer.
【单选题】Which of the following is the popular type of wearable device?
A.
Smartwatch
B.
Smartcar
C.
Smartphone
D.
All of the above
相关题目：