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【判断题】
就喷嘴计量量的形式来说,有轴针式喷嘴和式喷嘴两类。针式喷嘴不易堵塞。( )A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Students from a wide range of countries attend a professional exam: A questionnaire is sent to a selected number of students at the end of the exam which should be completed compulsorily. The samples ...
A.
Multi-stage
B.
Stratified
C.
Cluster
D.
Systematic
【单选题】When each data value in one sample is matched with a corresponding data value in another sample, the samples are known as
A.
corresponding samples
B.
matched samples
C.
independent samples
D.
None of these alternatives is correct.
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