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【单选题】
1第一台电子计算机诞生于1946年,但它“衰老”得很快。21955年,这台每秒只能运算5000次的巨人就被停止使用了。3到1957年,12岁的“埃尼阿克”已被人们拆得七零八落,正式进入了坟墓。41956年第二代电子计算机问世了。5它的元件不再是电子管,而是体积小得多,性能好得多的晶体管。6晶体管计算机的体积是电子管计算机体积的千分之一,但效率和寿命却高了1000倍。 选段主要采用的说明顺序是
A.
时间顺序
B.
空间顺序
C.
逻辑顺序
D.
道理顺序
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举一反三
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【单选题】It was for the third that she_______as the manager. A selected B had been selected C has been selected D was selected
A.
selected
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had been selected
C.
has been selected
D.
was selected
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宫腔粘连综合征
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B.
The exposed group is selected from the diseased population and unexposed group is selected from the population without the disease
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相关题目：
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paid
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【单选题】In a cohort study the subjects should be selected as follows:
A.
The exposed and unexposed groups are selected from the population who have had the outcome disease
B.
The exposed group is selected from the diseased population and unexposed group is selected from the population without the disease
C.
The exposed group is selected from the population without disease and unexposed group is selected from the population with the disease
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Two groups with or without exposure are selected from any population.
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