A.重點(diǎn)調(diào)查B.普查C.典型調(diào)查D.抽樣調(diào)查
A.14.87%B.12.56%C.41.41%D.21.05%
A.集中趨勢(shì)B.離中趨勢(shì)C.長(zhǎng)期趨勢(shì)D.隨機(jī)趨勢(shì)