皮皮学，免费搜题
登录
搜题
【单选题】
下列有关眼的血管,下列说法错误的是A.
眼球的血供来自眼动脉
B.
视网膜中央动脉是供应视网膜内层的唯一血管
C.
视网膜中央动脉供应视网膜所有层次
D.
视网膜中央动脉是人体唯一可直接观察的血管
E.
视网膜中央静脉与视网膜中央动脉伴行
手机使用
分享
复制链接
新浪微博
分享QQ
微信扫一扫
反馈参考答案：
举一反三
【单选题】In ________, sampling elements are selected by chance, that is, randomly.
A.
nonprobability sampling
B.
convenience sampling
C.
judgmental sampling
D.
probability sampling
E.
lotto sampling
【简答题】系统抽样(systematic sampling)
【单选题】Which of the following is a method of probability sampling?
A.
Simple random sampling
B.
Systematic sampling
C.
Stratified sampling
D.
All of the above are methods of probability sampling.
【单选题】________ is a nonprobability sampling technique that attempts to obtain a sample of convenient elements and leaves the selection of sampling units primarily to the interviewer.
A.
Convenience sampling
B.
Snowball sampling
C.
Simple random sampling
D.
Systematic sampling
E.
Window sampling
【多选题】The four commonly used non-probability sampling methods include:
A.
Convenience sampling
B.
Purposive sampling
C.
Quota sampling
D.
Snowball sampling
E.
Systematic sampling
F.
Stratified sampling
相关题目：
参考解析：
知识点：
题目纠错 0
发布
