A.存儲(chǔ)實(shí)際的KeyValue數(shù)據(jù) B.存儲(chǔ)數(shù)據(jù)的起點(diǎn) C.指定字段的長(zhǎng)度 D.存儲(chǔ)數(shù)據(jù)塊的起點(diǎn)