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2000年秋季，为了解河南省农民膳食营养情况，我们抽取地处河南南北的商水县和内黄县各两个自然村作为调查点，在两个县各随机抽取两个自然村的33个农户，对其家中3岁以上人员进行为期3天膳食调查。因其中3户人员外出，调查缺项较多舍去，故实际调查63户。调查采用3日称重记帐?
In the autumn of 2000, in order to understand the dietary nutrition of peasants in Henan Province, we took two villages in Shangshui County and Neihuang County located in north and south of Henan as survey sites, and randomly selected 33 peasant households from two natural villages in two counties, A 3-day dietary survey of people over the age of 3 in their home. Due to the fact that three of them went out and the survey lacked more items, 63 were actually surveyed. Survey using 3 weighed account?