A (72) is a file that contains metadata—that is，data about data.(72)

A．document

B．Excel table

C． database

D．data dictionary

[单选题]( 72) is a file that contains metadata-that is, data about data.(72) A. documentB． Excel tableC． databaseD． data dictionary

[单选题]A． data( )is a file that contains metadata—that is，data about data.A．structureB．tableC．baseD．dictionary

[名词解释] 元数据（metadata）

[单选题], the brains of a computer, it contains the ALU, the clock, many registers, the bus interface, and circuitry that makes these pans work together.A．I/O deviceB．CPUC．MemoryD．Operating system

[单选题](An overall cellular network contains a number of different elements from the base transceiver station (BTS) itself with its antenna back through a base station controller (BSC), and a mobile switching centre (MSC) to the location registers (HLR and

[试题]A management domain typically contains a large amount of management information. Each individual item of( 71)information is an instance of a managed object type. The definition of a related set of managed (72) types is contained in a Management Inform

[单选题]The cylinder contains a great weight of air and is capable of burning a great quantity of fuel at（）.A . the beginning of the compression strokeB . the beginning of the suction strokeC . the end of the working strokeD . the end of the exhaust stroke

[单选题]For relation where primary key contains multiple attributes，no non-key attribute should be functionally dependent on a part of primary key．This relation R is at least in (66) .(66) A．3NFB．2NFC．INFD．BCNF

[单选题]A typical (66) language contains an applicative sublanguage which approximates the mathematical abstractions of"timeless"functions applied to "spaceless" values, where the actual operation sequences and use of storage space during expression eva

[单选题]A． complete computer system contains(74)。A．arithmetic unit, control unit and memoryB．input/output devices and mainframeC．mainframe. and programs of utilityD．hardware system and software system