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【多选题】
弧柱区压降与( )有A.
电流大小
B.
电压大小
C.
弧隙长度
D.
介质种类
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皮皮学刷刷变学霸
举一反三
【单选题】Which of the following statements describes the definition of systematic sampling?
A.
Every nth number of the population is selected
B.
Every element of one definable sub-section of the population is selected
C.
Each element of the population has an equal chance of being chosen
D.
This method needs investigating prior information in advance
【简答题】听下面一段对话，回答第1-3小题。 1. What is the probable relationship between the speakers? A. Friends B. Classmates C. Co-workers 2. What does the man like to do? A. To cycle. B. To garden. C. To climb mountains. 3...
【多选题】Which of the following statement about systematic sampling is/are true?
A.
Sample members are selected from the sampling frame according to a random starting point and a fixed, periodic interval.
B.
The interval, called the sampling interval Kth, is calculated by dividing the population size N, by the desired sample size n. Kth=N/n
C.
The starting point can be obtained in a lottery method.
D.
The starting point can be obtained by using a random number table.
E.
It is a method belonging to non-probability sampling.
【简答题】90°偏刀主要用来车削（）的工件。
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