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【单选题】
若要通过样本作统计推断,样本应该是A.
总体中典型的一部分
B.
总体中任意的一部分
C.
总体中随机抽取的一部分
D.
总体中有意义的一部分
E.
总体中信息明确的一部分
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举一反三
【简答题】阅读理解。 I'm Mary. I have a piece of good news to tell you. My parents bought a new flat in the centre of the city. The rooms are not big, but they are all comfortable. There are more rooms than our old ...
【简答题】The workman __________ (flat) a piece of metal by hammering it.
【简答题】I’m Mary. I have a piece of good news to tell you. My parents bought a new flat in the centre of the city. The rooms are not big, but they are all comfortable. There are more rooms than our old flat. ...
【单选题】A ___ of something is a round flat piece or area of it.
A.
box
B.
circle
C.
rectangle
D.
triangle
【简答题】:a thin flat piece of food that has been cut off a larger piece.
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