A、in need
B、in short
C、short of
D、needed
第1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2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3题:
第4题:
OFDM的英文是()
A.OverloadFrequencyDivisionMultiplexing
B.Orthogonal?Frequency?Division?Multiplexing
C.Overwhelming?Frequency?DivisionMultiplexing
D.Outstanding?Frequency?Division?Multiplexing
第5题:
The population of the world ____ still ____ now.
A.has; grown B.is; growing C.will; grow D.is; grown
第6题: