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【单选题】
当总体内部差异比较大时,比较适合的抽样组织方式是( )。A.
系统抽样
B.
整群抽样
C.
分层抽样
D.
简单随机抽样
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反馈参考答案：
举一反三
【单选题】Now you will hear a passage. At the end of the passage, you will hear some questions. After you hear a question, choose the best answer from the four choices.
A.
Because she wanted to save people’s lives.
B.
Because she got excellent scores on exams.
C.
Because she was so confident in herself.
D.
Because her mother was born blind.
【简答题】请简要概述下设计主图和商品详情页时如何借助价格、竞争优势增强销售导向。
【单选题】病人女性，50岁，有风湿性心脏病二尖瓣狭窄、心力衰竭，进行强心、利尿、扩血管治疗，以下药物不属于增强心肌收缩力类药物的是
A.
地高辛
B.
多巴酚丁胺
C.
氨力农
D.
氨茶碱
E.
毒毛花甙K
【单选题】病人女性，50岁，因咳嗽、咳痰、尿少、呼吸困难加重，既往有风湿性心脏病二尖瓣狭窄、心力衰竭。医生考虑病人有急性左心衰，其咳嗽、咳痰的性质是
A.
白色浆液样痰
B.
偶尔咳嗽，咳粉红色泡沫样痰
C.
频频咳嗽，咳大量粉红色泡沫样痰
D.
偶尔咳嗽，咳白色泡沫状痰
E.
痰中带血丝
【单选题】Directions: Now you will hear a passage. At the end of the passage, you will hear some questions. After you hear a question, choose the best answer from the four choices.
A.
Because she wanted to save people's lives.
B.
Because she got excellent scores on exams.
C.
Because she was so confident in herself.
D.
Because her mother was born blind.
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