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【单选题】
正等轴测图的轴向伸缩系数是多少?A.
p=q=r=1
B.
p=q=r=2
C.
p=q=r=0.5
D.
p=q=r=1.5
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【简答题】New inventions make old ones ____obsolete____. For instance, because of the compact disk, the phonograph record is now outdated. ____
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A.
not make
B.
not making
C.
not to make
D.
do not make
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A.
True
B.
False
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【简答题】电子商务的服务功能有哪些？
【简答题】电子商务的服务功能有哪些?
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