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【单选题】
Django 2.2 restful应用中在views.py文件中创建视图类继承_______。A.
viewsets.ModelViewSet
B.
rest_framework.viewsets.ModelViewSet
C.
api.viewsets.ModelViewSet
D.
ModelViewSet
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举一反三
【简答题】E—commerce involves exchanges among（ ）．
【单选题】All of the following were visions of e-commerce expressed during the early years of e-commerce except:
A.
a nearly perfect information marketspace.
B.
friction-free commerce.
C.
disintermediation.
D.
fast follower advantage.
【判断题】将 R134a制冷剂加入R12系统中,由于R134a制冷剂与R12系统中的冷冻油不相溶,空调工作时,压缩机中的冷冻油被压出去后无法在随制冷剂返回,最后导致压缩机润滑不良而烧死。
A.
正确
B.
错误
【判断题】将 R134a制冷剂加入R12系统中,由于R134a制冷剂与R12系统中的冷冻油不相溶,空调工作时,压缩机中的冷冻油被压出去后无法再随制冷剂返回,最后导致压缩机润滑不良而烧死。
A.
正确
B.
错误
【简答题】(名词解释)E-Commerce
【单选题】Which of the following statements about e-commerce is true?
A.
E-commerce is technology in essence.
B.
E-commerce is website building.
C.
E-commerce is bubble.
D.
E-commerce is commerce in essence.
【单选题】Which of the following is NOT true about European e-commerce markets?
A.
European e-commerce is mainly dominated by American giants.
B.
Established European retailers were hesitant to leave the market to U.S. businesses.
C.
American giants are quite successful in European markets.
D.
Both auctions and retail markets are controlled by U. S. giants.
【单选题】Which of the following is not true of e-commerce?
A.
E -commerce ’ s Chinese name is 电子商务
B.
Nowadays e-commerce Internet penetration rate was 60%.
C.
To stay competitive, firms have searched for greater coordination and collaboration among supply chain partners to wring out the inefficiencies.
D.
E lectronic commerce offers no opportunities to both developing and developed countries.
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