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【单选题】
抽样调查时首先选择一组调查单位,对其实施调查之后,再请他们提供另外一些属于研究总体的调查对象,调查人员根据所提供的线索,进行此后的调查,这样的调查方式称为( )A.
系统抽样
B.
整群抽样
C.
滚雪球抽样
D.
判断抽样 prefix="o" ns="urn:schemas-microsoft-com:office:office"? ?xml:namespace>
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反馈参考答案：
举一反三
【单选题】If you see the cartoon film, it will make you .
A.
laugh
B.
to laugh
C.
laughing
D.
laughed
【单选题】— ____________________ — My name is Li Ming. [ ]
A.
Hi!
B.
Hello!
C.
What's your name?
【单选题】If you see an English policeman for the first time, you will probably notice at once that ______.
A.
he often tells people time
B.
he is usually very helpful
C.
he has a helmet on his head
D.
he wears special clothes
【简答题】If you see someone drowning, speed is very important. Once you get him out of the water, if he isn't breathing. you have four minutes before his brain is completely destroyed. Support his neck, tilt(倾...
【单选题】In the figure above, the factor responsible for the decline in the interest rate is
A.
a decline the price level.
B.
a decline in income.
C.
an increase in the money supply.
D.
a decline in the expected inflation rate.
【简答题】逆向工程技术与正向设计的区别是什么，逆向工程技术有哪些特点？
【单选题】与动脉粥样硬化发生关系最为密切的血脂是
A.
HDL(高密度脂蛋白)
B.
TG(三酰甘油)
C.
LDL(低密度脂蛋白)
D.
VLDL(极低密度脂蛋白)
E.
CM(乳糜微粒)
【简答题】阅读理解 If you see someone drowning, speed is very important. Once you get him out of the water, if he isn't breathing, you have four minutes before his brain is completely destroyed. Support his neck, ...
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