The term semi-log refers to a graphical scale that has ______.
A、a linear axis and a log axis
B、a log-log structure
C、a linear vertical axis and a log horizontal axis
D、All of the above
A、a linear axis and a log axis
B、a log-log structure
C、a linear vertical axis and a log horizontal axis
D、All of the above
第1题
The term e-commerce refers to all commercial transactions conducted over the Internet, including transactions by consumers and business-to-business transactions. Conceptually, e-commerce does not __67__ from well-known commercial offerings such as banking by phone, "mail order" catalogs, or sending a purchase order to supplier __68__ fax.E-commerce follows the same model __69__ in other business transactions; the difference __70__ in the details.
To a consumer, the most visible form. of e-commerce consists __71__ online ordering. A customer begins with a catalog of possible items, __72__ an item, arranges a form. of payment, and __73__ an order. Instead of a physical catalog, e-commerce arranges for catalogs to be __74__ on the Internet. Instead of sending an order on paper or by telephone, e-commerce arranges for orders to be sent __75__ a computer network. Finally, instead of sending a paper representation of payment such as a check, e-commerce __76__ one to send payment information electronically.
In the decade __77__ 1993, e-commerce grew from an __78__ novelty (新奇事物) to a mainstream business influence. In 1993, few __79__ had a web page, and __80__ a handful allowed one to order products or services online. Ten years __81__, both large and small businesses had web pages, and most __82__ users with the opportunity to place an order. __83__, many banks added online access, __84__ online banking and bill paying became __85__. More importantly, the value of goods and services __86__ over the Internet grew dramatically after 1997.
A.distract
B.differ
C.descend
D.derive
第2题
A.has a great impact on human life
B.has some characteristics of human nature
C.can replace some aspects of the human mind
D.does not exist in the natural world
第3题
1. Explain the following terminologies: The generalized Hooke's law Strain energy per unit volume, for normal and shearing stress: Incremental theories: Total strain theories: Ture stress: True strain: 2. A cubic metal, with the edge length of 200 mm, elastic modulus E = 207×1000 MPa, and Poisson’s ratio ν = 0.3, is compressed along Z direction, and the metal expands along X and Y directions. If the compression along Z direction is 200 MPa, in order to limit the expansion along X and Y directions within 0.05 mm, what is the compression should be applied along X and Y directions?
第4题
A.has a gent impact on human life
B.has some characteristics of human nature
C.can replace some aspects of the human mind
D.does not exist in the natural world
第5题
From the same survey referred to in Pronblem 1, Table 5.11 cross-classi?es whether a person smokes frequently with the four scales of the MBTI personality test. SAS reports model?2 log likelihood values of 1130.23 with only an intercept term, 1124.86 with also the main effect predictors, 1119.87 with also all the two-factor interactions, and 1116.47 with also all the three-factor interactions. a. Write the model for each case, and show that the numbers of parameters are 1, 5, 11, and 15. b. According to AIC, which of these four models is preferable? c. When a classi?cation table for the model containing the four main effect terms uses the sample proportion of frequent smokers of 0.23 as the cutoff, sensitivity = 0.48 and speci?city = 0.55. The area under the ROC curve is c =0.55. Does knowledge of personality type help you predict well whether someone is a frequent smoker? Explain.
第6题
A.Looking back on the "good old days" makes modern man's life all the more stressful.
B.Now that less work is physical and more is mental, it is relatively difficult to remove oneself —physically and mentally —from it.
C.The sophisticated communication technology is keeping busy men and women "within call" no matter whether they are at home or on vacation.
D.Both B and C.
第7题
A.doubts
B.suspects
C.suspicions
D.uncertainty
第8题
technology has benefited from the unique opportunity to
shape product definitions, forcing followers to adapt to a
standard or invest in an unproven alternative. Today, how-
( 5) ever, the largest payoffs may go to companies that lead in
developing integrated approaches for successful mass
production and distribution.
Producers of the Beta format for videocassette recorders
(VCR’s), for example, were first to develop the VCR com-
(10) mercially in 1975, but producers of the rival VHS (Video
Home System) format proved to be more successful at
forming strategic alliances with other producers and
distributors to manufacture and market their VCR format
Seeking to maintain exclusive control over VCR distri-
(15) bution. Beta producers were reluctant to form. such alli-
ances and eventually lost ground to VHS in the compe-
tition for the global VCR market.
Despite Beta’s substantial technological head start and
the fact that VHS was neither technically better nor cheaper
(20) than Beta, developers of VHS quickly turned a slight early
lead in sales into a dominant position. Strategic alignments
with producers of prerecorded tapes reinforced the VHS
advantage. The perception among consumers that prere-
corded tapes were more available in VHS format further
(25) expanded VHS’s share of the market. By the end of the
1980’s. Beta was no longer in production.
The primary function of the second paragraph of the passage is to______
A.identify problems
B.warn of consequence
C.explain effects
D.evaluate solutions
E.recommend actions
第9题
A.Motavalli knows a lot about auto technological advances
B.Motavalli supports both auto technology and environment
C.Motavalli is so interested in environmental protection
D.Motavalli is specialized in auto manufacturing and fuel
第10题
A.Motavalli knows a lot about auto technological advances
B.Motavalli supports both auto technology and environment
C.Motavalli is so interested in environmental protection
D.Motavalli is specialized in auto manufacturing and fuel
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