题目内容

增大轴在截面变化处的过渡圆角半径，可以_____。

A. 使零件的轴向定位比较可靠
B. 降低应力集中，提高轴的疲劳强度
C. 使轴的加工方便
D. 使零件的周向定位比较可靠

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当采用套筒、螺母或轴端挡圈作轴向定位时，为了使零件的端面靠紧定位面，安装零件的轴段长度应零件轮毂的宽度。

A. 大于
B. 小于
C. 等于
D. 都可以

合金钢对应力集中较敏感，设计合金钢时更应注意从结构上避免应力集中。

A. 对
B. 错

China FAWTime of founding: __1Founder: Rao Bin, the father of _2_Headquarter: Changchun, ChinaProducts:1)Jiefang: the first truck rolled off the production lineon 3_2)Hongqi: Launched in 1958, meaning Red Flag, the first domestic production of Chinese 4The logo of “Winged1”: standing for FAW like 5_ that spreads its wings flying in the high blue sky.

VolkswagenTime of founding: __1Founder: Ferdinand PorscheHeadquarter: _2_Main products: Volkswagen Golf, Volkswagen Beetle , Volkswagen Passat, etc.Cooperative partners: major joint-ventures in China1) 32) Shanghai Volkswagen.Logo: two letters -- a V over a W -- in a circle stands for 4.The blue color on the background represents reliability, _5_____ and excellence.