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【单选题】
调查某市居民收入情况,先按职业把居民分为工人、干部等等若干组,然后再在各组中运用判断抽样方法抽取预定数目的样本进行调查,这种抽样属于A.
配额抽样
B.
分群随机抽样
C.
分层随机抽样
D.
单纯随机抽样
拍照语音搜题，微信中搜索"皮皮学"使用
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皮皮学刷刷变学霸
举一反三
【单选题】Another name for Machu Picchu is _____
A.
Aguas Calientes
B.
One of the magnetic centres of the ancient world
C.
the Lost City of the Inca
【简答题】How big is the Machu Picchu?
【简答题】Machu Picchu está en________.
【简答题】Machu Picchu is considered to be a truly extraordinary archaeological(考古学的) discovery and is one of South America’s largest tourist sites. As many as one thousand visitors visit the ancient Incan（印加文化...
【单选题】Machu Picchu may be changed forever by __________.
A.
the weather
B.
poverty
C.
tourism
【简答题】When was Machu Picchu discovered?
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