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【单选题】某林场有树苗30000棵，其中松树苗4000棵，为调查树苗的生长情况，采用分层抽样的方法抽取一个容量为150的样本，则样本中松树苗的数量为[ ]
A.
30
B.
25
C.
20
D.
15
【单选题】On a cool June morning, Liz Neumark is stirring up a simple summer soup for some very demanding clients. As cofounder and CEO of Great Performances, one of New York City’s most successful catering com...
A.
let the kids plant and cook fresh food by themselves
B.
show city kids where real food comes from and what it tastes like
C.
prevent the kids from eating processed food, soda and sweets
D.
convince children to change their unhealthy eating habits
【单选题】某林场有树苗60000棵，其中松树苗4000棵．为调查树苗的生长情况，采用分层抽样的方抽取一个容量为300的样本，则样本中松树苗的数量为（ ）
A.
30
B.
20
C.
25
D.
15
【单选题】某林场有树苗30000棵，其中松树苗4000棵．为调查树苗的生长情况，采用分层抽样的方法抽取一个容量为150的样本，则样本中松树苗的数量为（ ）
A.
30
B.
25
C.
20
D.
15
【单选题】某林场有树苗30000棵，其中松树苗4000棵．为调查树苗的生长情况，采用分层抽样的方法抽取一个容量为150的样本，则样本中松树苗的数量为（ ）
A.
30
B.
25
C.
20
D.
15
【单选题】On a cool June morning, Liz Neumark is stirring up a simple summer soup for some very demanding clients. As cofounder and CEO of Great Performances, one of New York City’s most successful catering com...
A.
arrived at Neumark’s Farm that morning with his parents
B.
swallowed a bowl of soup and vomited immediately
C.
will try this kind of soup later in his life and like the taste
D.
knows where the vegetable comes from and how the soup tastes