皮皮学，免费搜题
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【单选题】
矢量说法错误的是A.
与标定用的回路大小、形状无关
B.
反映畸变的大小
C.
反映畸变的方向
D.
与位错线方向有关
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following is not necessary for a random sample from a population of 15 individuals?
A.
Each individual in the population has a 1/15 probability of being selected
B.
The selection of one individual is independent of the selection of any other individual
C.
After 15 selections, each individual must have been selected exactly one time
D.
The individual obtained on any specific selection must be unpredictable
【判断题】In a sample of size 40, the sample mean is 15. In this case, the sum of all observations in the sample is ∑ Xi = 600.
A.
正确
B.
错误
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