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【单选题】
同方向列车以站间区间为间隔运行的运行图称为（ ）。A.
非追踪运行图
B.
追踪列车运行图
C.
非平行运行图
D.
平行运行图
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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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