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【单选题】
将总体按主要标志进行分组,然后再按随机原则从各组中抽选出样本单位,这种抽样方式叫( )。
A.
等距抽样
B.
类型抽样
C.
简单随机抽样
D.
整群抽样
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沿着接触表面公法线方向压入支承面
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【单选题】光滑面约束只能限制物体的 运动。
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A.
沿着接触表面公法线方向压入支承面
B.
沿着接触表面公法线方向背离支承面
C.
沿着接触表面公切线方向压入支承面
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沿着接触表面公切线方向背离支承面
查看完整题目与答案
【简答题】选择正确的选项。 1. 妈妈问你口渴吗，她会说： [     ] A. Who are thirsty? B. Who is thirsty? C. Are you thirsty? 2. 当你想问别人想吃些什么时，你会说： [     ] A. What would you like to eat? B. What you like to eat? C. Would you like some ...
查看完整题目与答案
【单选题】某研究者欲调查北京市医院护士的护理工作满意度,由于受研究时间和经费的限制,他拟从50所北京的医院中随机抽取20所医院,然后对这20所医院内的符合研究对象入选标准的护士进行问卷调查。此研究者使用的抽样方法是
A.
单纯随机抽样
B.
整群抽样
C.
分层抽样
D.
系统抽样
查看完整题目与答案
【单选题】____ you thirsty? [     ]
A.
Are
B.
are
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B.
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C.
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