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【简答题】
照相机、投影仪、放大镜都是利用______成像，其中照相机成的是______像，物距与焦距的关系是______；投影仪成的是______像，物距与焦距的关系是______；放大镜成的是______像，物距与焦距的关系是______．
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举一反三
【单选题】Regarded as a kind of art form, toys ______.
A.
reflect the pace of social progress
B.
also appeal greatly to adults
C.
are not characterized by technological progress
D.
follow a direct line of ascent
【单选题】Which of the followings is not the form of market failure?
A.
Exercise of Monopoly Power in Markets
B.
Effects of Market Transactions on Third Parties other than Buyers and Sellers
C.
Lack of a Market for a Goods with a Marginal Social Benefit that Exceeds its Marginal Social Cost
D.
Complete Information
【单选题】___ form the basis of Emirati social structure.( )
A.
Family
B.
Tribal connections
C.
Society
D.
Family and tribal connections
【简答题】闭合水准丶附合水准内业计算方法过程?
【单选题】which of the followings is not the form of market failure?
A.
Exercise of Monopoly Power in Markets
B.
Effects of Market Transactions on Third Parties other than Buyers and Sellers
C.
Lack of a Market for a Goods with a Marginal Social Benefit that Exceeds its Marginal Social Cost
D.
Complete Information
【多选题】下面关于水准测量内业,说法正确的是( )。
A.
高差闭合差等于各个测站观测高差之和
B.
闭合水准路线高差闭合差的理论值为0
C.
闭合差分配是把误差分配到每一测站上
D.
闭合差分配是把误差分配到每一测段上
【单选题】梁内弯起钢筋的抗剪承载力 ,式中0.8是用来考虑:
A.
弯起筋易引起梁内混凝土劈裂，从而降低抗剪承载力
B.
弯起筋与临界斜裂缝的交点有可能靠近剪压区致使弯起筋在斜截面破坏时达不到屈服
C.
考虑弯起筋的施工误差
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