题目内容
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A、The cause of the disease can be determined.
B、A variety of factors can be measured in an investigation.
C、The sample size is relatively small in the sampling survey.
D、There is less bias in the investigation.
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A、and not stop for rest
B、as well as not to stop for rest
C、and not stopping for rest
D、and stopping not for rest
A、Monitoring
B、Case investigation
C、Prevalence survey
D、Ecological study
A、Not suitable for diseases with a low prevalence rate.
B、The progress of the investigation is fast and the workload is relatively small.
C、The design and implementation are more complex.
D、Small sample size
A、Census
B、Sampling survey
C、Ecological study
D、Longitudinal research
A、Persons suffering from the diseases studied
B、Persons who do not suffer from the diseases studied
C、People with etiological factors
D、People who don't have etiological factors
A、The direction of observation is from "cause" to "result"
B、The direction of observation is from "result" to "cause"
C、There should be complete and reliable exposure data of the subjects in the past for a certain period of time
D、There should be complete and reliable information on the outcome of the subjects in the past period of time
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