A.元数据是描述数据仓库内部数据结构的数据
B.可以从原有数据库系统中抽取而来
C.都是独立系统的静态数据
D.反映用户数据历史上的变化情况
E.不能从原有数据库系统中直接得到
第1题
A.automatically controlled
B.off power
C.continuously manned
D.continuously unmanned
第2题
第3题
第4题
A bathing-woman's job was to ______.
A.attend to the bathing machine
B.dip the attendant
C.force the bather to emerge from the bathing machine
D.force the bather under the water when she came out of the machine
第5题
A bathing-woman's job was to ______.
A. attend to the bathing machine
B. dip the attendant
C. force the bather to emerge from the bathing machine
D. force the bather under the water when she came out of the machine
第6题
A、an allele that confers a phenotype on the organism when heterozygous; that is, when present in only one copy
B、an allele that confers a phenotype only when both copies of the gene are mutant; that is, when homozygous
C、an allele that is commonly found in wild populations, as opposed to alleles found in laboratory strains or when a pathological condition is present
D、an allele that confers a normal phenotype under some conditions, but confers a different, mutant phenotype when conditions such as elevated temperature are present
第7题
Experiments have to be made under carefully _____ conditions .
A.treated
B.supplied
C.related
D.controlled
第8题
According to the fifth paragraph, under what conditions are algae able to use solar energy to make hydrogen? _______A When there is a lot of oxygen in the air.B When there is no oxygen in the air.C When photosynthesis is taking place.D When enough starch is stored.
第9题
A、increasing returns to scale.
B、imperfect competition.
C、intra-industry trade.
D、inter-industry trade.
第10题
Under L/C operations,the bank will effect payment under the following conditions().
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