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【单选题】
为了比较同一组儿童身高和体重两项指标的变异程度的大小，可选用的变异指标为A.
全距
B.
标准差
C.
方差
D.
变异系数
E.
四分位数间距
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【单选题】Questions 8 (Suggested completion time: 2 minutes) Directions: Read the text, and answer the question according to the text. When hunting raccoons for fur was a popular sport, hunting dogs were used t...
A.
solitary
B.
aggressive
C.
nocturnal
D.
herbivorous
【简答题】求证: $ x(A(x)∧B(x)) Þ $ xA(x)∧ $ xB(x)
【单选题】An important new industry, oil refining(炼油), grew after the Civil War．Crude oil,or petroleum--a dark, thick ooze from the earth--had been known for hundreds of years.But little use had ever been made ...
A.
Oil refining: a historical perspective.
B.
The California gold rush: get rich quickly.
C.
Private property: trespassers will be prosecuted.
D.
Kerosene lamps: a light in the tunnel.
【简答题】半导体二极管为何反向截止时仍然有少量电流?
【单选题】A: Do you like ice cream? B: Yes, I do. This is an example of______.
A.
reference
B.
substitution
C.
conjunction
D.
ellipsis
【单选题】When a feature whose characteristics or descriptions remain unchanged is to be shifted to small distance(s), ______ command is used on a chart.
A.
MOVE
B.
DELETE
C.
AMEND
D.
SUBSTITUT
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