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【单选题】
在各类几率抽样方法中，抽样误差相对较小的是（）A.
简单随机抽样法
B.
分层随机抽样法
C.
分群随机抽样法
D.
系统等距抽样法
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】Why were early umbrellas difficult to use?
A.
Because they were very big.
B.
Because they were very small.
C.
Because they were made of wood.
【简答题】Why were you a______ from school yesterday?
【单选题】The reason ________they were fired was ____they were not honest.
A.
for ;because
B.
why ; that
C.
for ;that
D.
why ;because
【单选题】- Alice,why didn't you come yesterday? - I , but I had an unexpected visitor.
A.
had
B.
would
C.
was goingto
D.
did
【单选题】Why were the three on hunger strike?
A.
They were beaten up by the police guard.
B.
They were not given enough food to eat.
C.
They were put in solitary confinement.
D.
They were charged without any evidence.
【简答题】无论植物细胞的初生壁还是次生壁，其构架物质都是( )。
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