There used to be an old city here, which was ()under the river about 2000 years ago.
A、insulted
B、insulated
C、buried
D、interrupted
第1题:
About 2000 years ago, the chinese paper was made () the hair-like parts of certain plants.
A、from
B、of
C、into
D、out of
第2题:
It’s dangerous to swim in a ________ river.
A、rough
B、roughing
C、calm
D、roughed
第3题:
关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)→ZIP, P→CITY},关系模式CSZ的主属性是
A.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP
第4题:
A、round/ old/ rosewood
B、rosewood/ old/ round
C、old/ round/ rosewood
D、old/ rosewood/ round
第5题:
关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)+ZIP, ZIP→CITY},关系模式CSZ的主属性是
A.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP
第6题:
关系模式CSZ(CITY,ST,ZIP)其属性组上的函数依赖集为F={(CITY,ST)→ZIP,ZIP→CITY},关系模式CSZ的主属性是
A.ZIP
B.CITY,ST,ZIP
C.CITY,ZIP
D.ST,ZIP