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计算题：龙门斜口剪板机的设计规范规定，被剪材料的抗拉强度为σ b =530MPa，现有一台规格为19mm剪切斜倾角7°的龙门斜口剪板机，问它是否能剪切板厚为16mm的4Cr13钢板。（σ b =588MPa，tg7°=0.123）
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【单选题】With which of the following criticisms of Leonard's theory would the author of the passage be most likely to agree?
A.
It lays too much importance upon the antebellum ideology of women's nature and sphere.
B.
It fails to acknowledge that masculinization of women's war-time efforts may have been detrimental to the feminist cause.
C.
It tends to overemphasize the role of women in shifting their status over the course of the war.
D.
It basis its thesis too exclusively on white, Yankee, middle-class women, ignoring every other social and racial class.
E.
It omits to articulate the precise antebellum moral definition of womanhood that is its theme.
【单选题】According to the theory of the firm, which of the following statements describes an oligopoly?
A.
There are no barriers to entry into or exit from the market
B.
There is only one producer in the market
C.
There are four producers exerting considerable influence in the market
D.
There are many producers but they each use product differentiation to distinguish themselves from each other
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