题目内容
（请给出正确答案）
the three major tissue systems in plants？
A、Meristem tissue
B、Ground tissue
C、Dermal tissue
D、Vascular tissue
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A、the frequency for each class.
B、the relative frequency for each class.
C、trends in the data.
D、the class midpoints.
A、This time fate was smiling to him.
B、The old man’s hair is as white as snow.
C、He drowned in a sea of grief.
D、Her cheeks are red like a rose.
A、the World Champions
B、the European Cup
C、the Olympic games
D、the Korean Cup
A、A clothing retailer with the best location in a mall
B、A grocery store in a large city
C、A grocery store in a midum-size city
D、The only gas station in a small, isolated town
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.
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
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