A.不帶時標的電網(wǎng)運行動態(tài)數(shù)據(jù)和實時穩(wěn)態(tài)數(shù)據(jù)的數(shù)據(jù)庫 B.帶時標的電網(wǎng)運行動態(tài)數(shù)據(jù)和實時穩(wěn)態(tài)數(shù)據(jù)的數(shù)據(jù)庫 C.帶時標的歷史穩(wěn)態(tài)數(shù)據(jù)的數(shù)據(jù)庫 D.不帶時標的歷史穩(wěn)態(tài)數(shù)據(jù)的數(shù)據(jù)庫
A.1μs/h B.1ms/h C.1ns/h D.1s/h
A.單表查詢 B.SQL查詢 C.綜合查詢 D.多表查詢