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【单选题】
要研究某社区30-49岁健康男性血清胆固醇总胆固醇含量,应采用什么抽样方法A.
单纯随机抽样
B.
系统抽样
C.
分层抽样
D.
整群抽样
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举一反三
【单选题】Both the number and the amount of money involved in these cases have been increasing.
A.
T
B.
F
【单选题】Fridays we often go out to dinner, watch a movie,and talk – you know, the usual.
A.
On
B.
Up
C.
About
【判断题】Both the number and the amount of money involved in these cases have been increasing.
A.
正确
B.
错误
【判断题】Both the number and the amount of money involved in these cases have been increasing.
A.
正确
B.
错误
【多选题】In which of these cases will not the tax burden fall most heavily on sellers of the good?
A.
The demand curve is relatively steep and the supply curve is relatively flat.
B.
The demand curve is relatively flat and the supply curve is relatively steep.
C.
The demand curve and the supply curve are both relatively flat.
D.
The demand curve and the supply curve are both relatively steep.
相关题目：
【单选题】Both the number and the amount of money involved in these cases have been increasing.
A.
T
B.
F