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【单选题】
先将总体划分为若干群,然后以群作为抽样单位从中抽取部分群,再对抽中的各个群中所包含的所有元素进行观察,这样的抽样方法称为()A.
简单随机抽样
B.
分层抽样
C.
系统抽样
D.
整群抽样
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皮皮学刷刷变学霸
举一反三
【单选题】以下关于流变学的描述正确的是
A.
牛顿流动的流体在层流条件下的剪切应力S与剪切速度D成正比
B.
塑性流动的流动曲线经过原点
C.
假塑性流动的流体随着剪切应力的增大而粘度增大
D.
胀性流动曲线显示随着剪切应力的增大其粘性也随之减小
【单选题】The impact of Einstein’s breakthrough in the field of photo electric effect ____ the understanding of the universe was simply tremendous.
A.
in
B.
on
C.
with
D.
about
【单选题】The effect of education on marriage has been found to be______.
A.
favorable
B.
insignificant
C.
long-lasting
D.
extensive
【简答题】Their efforts to improve the school education have been very ______(effect).
【单选题】以下关于流变学的描述正确的是( )
A.
塑性流动的流动曲线经过原点；
B.
假塑性流动的流体随着剪切应力的增大而粘度增大；
C.
牛顿流动的流体在层流条件下的剪切应力S与剪切速度D成正比；
D.
胀性流动曲线显示随着剪切应力的增大其粘性也随之减小。
【单选题】What’s the effect of the “experimental” bilingual education programs to Hispanic children?
A.
They can speak both Spanish and English fluently.
B.
It holds back children from learning the English that they need and their parents desire.
C.
It has well prepared Hispanic students.
D.
It helps the children to learn English.
【单选题】The best title for this passage would be ______.
A.
The Effect of Education on Lifetime Earnings
B.
How Much Can We Make During Our Lifetime
C.
The Way to Earn More Money through Education
D.
How to Make an Investment in Higher Education
【单选题】Education's effect on productivity:
A.
is believed to be less important than the amount of physical capital a worker has available.
B.
is even more important than increases in physical capital.
C.
has fallen in the past century in the United States.
D.
depends on the wealth of the country.
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