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【单选题】
革兰阴性菌细胞壁成分中无( )A.
肽 聚糖
B.
磷壁酸
C.
脂蛋白
D.
脂多糖
E.
外膜
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【简答题】为了解某校高中学生的视力情况，对该校学生按年级进行分层抽样调查，已知该校高一、高二、高三分别有学生800名、600名、500名，若高三学生共被抽取25名，则高一年级应被抽取的学生数为 ．
【单选题】What do you think of Qingdao?
A.
birthplace of traditional Chinese culture
B.
political, economic and cultural center , City of Springs
C.
a beautiful seaside city,beer,good weather,fine beaches
D.
Penglai Pavilion, the story of the Eight Immortals
E.
the leader of Five Scared Mountains, 30 old temples and 66 scenic spots
【单选题】Qufu is _____________________
A.
birthplace of traditional Chinese culture
B.
political, economic and cultural center , City of Springs
C.
a beautiful seaside city,beer,good weather,fine beaches
D.
Penglai Pavilion, the story of the Eight Immortals
E.
the leader of Five Scared Mountains, 30 old temples and 66 scenic spots
【单选题】Taian is _________
A.
birthplace of traditional Chinese culture
B.
political, economic and cultural center , City of Springs
C.
a beautiful seaside city,beer,good weather,fine beaches
D.
Penglai Pavilion, the story of the Eight Immortals
E.
the leader of Five Scared Mountains, 30 old temples and 66 scenic spots
【单选题】Mount Tai is _____________________
A.
birthplace of traditional Chinese culture
B.
political, economic and cultural center , City of Springs
C.
a beautiful seaside city,beer,good weather,fine beaches
D.
Penglai Pavilion, the story of the Eight Immortals
E.
the leader of Five Scared Mountains, 30 old temples and 66 scenic spots
【简答题】某校为了解学生的视力情况，要从不同年级抽取学生100人测量他们的视力．已知该校高一、高二、高三分别有学生1500人、1800人、1700人，则应从高一年级抽取______人．
【单选题】某校期末考试后，为了解该校高一年级1000名学生的学习成绩，从中抽取了100名学生的成绩单进行分析，就这个问题来说，下面说法中正确的是 [ ]
A.
1000名学生是总体
B.
每个学生是个体
C.
100名学生的成绩是一个个体
D.
样本容量是100
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