问题
单项选择题 A1型题
若不知总体标准差，反映均数抽样误差大小的指标用（）
A.S
B.Sx
C.SP
D.σP
E.σX
答案
参考答案：B
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若不知总体标准差，反映均数抽样误差大小的指标用（）
A.S
B.Sx
C.SP
D.σP
E.σX
参考答案：B
| 选词填空。 | |
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| 1. —_____ is Li Lei's mother? —She's thirty-three. 2. Mother's Day is the second Sunday of _____. 3. Eighteen boys are in the classroom. You are the _____ one. 4. —What's your _____? —It's July 22nd. 5. We go to _____ party this Sunday. 6. Let's go to the soccer _____ on May 15th. 7. Many _____ people have English names. 8. _____12th is Tree Planting Day(植树节). 9. Lisa is _____ and her brother is ten years old. 10. My sister doesn't like sports, but she likes _____. |