A.存取受限的線性結(jié)構(gòu) B.存取不受限的線性結(jié)構(gòu) C.存取受限的非線性結(jié)構(gòu) D.存取不受限的非線性結(jié)構(gòu)
A.:= B.SELECT INTO C.FETCH INTO D.=
A.EMPTY B.ANY C.entity D.cdata