Which of the following are properties of relations?
A) Each attribute has a unique name.
B) No two rows in a relation are identical.
C) There are no multivalued attributes in a relation.
D) All of the above.
D
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An external search for product information is likely to occur when
A. the risk of making a wrong purchase decision is low. B. review of past experience provides adequate information. C. the cost of gathering information is low. D. the item is for personal use rather than for professional use. E. the item is frequently purchased.
An electrical generator has a mean time between failures of 167 hr and mean time to repair of 17 hr. In this case, the availability is ______.
A. 0.908 B. 0.900 C. 0.980 D. 0.960
What is a microblog?
A. a blog service that supports only short posts B. a blog whose owner doesn't post very often C. a blog run by a small business D. a blog that supports only links to other posts E. a blog that targets a very small consumer group
Depreciation expense under the double-declining-balance method is equal to the book value of the asset at the beginning of the period multiplied by twice the straight-line depreciation rate.
Answer the following statement true (T) or false (F)