题目内容

滚动轴承径向游隙共有6个组别，其中最小的径向游隙组别代号是“/C1”。

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将轴做成阶梯形，主要是为了减轻轴的重量，降低制造费用。

为了提高轴的刚度，一般采用的措施是用合金钢代替碳钢。

按扭转强度条件计算轴的受扭转轴段的最小直径时，没有考虑弯矩的影响。

A: Hello, what are you looking at? B: ________. I am planning to travel, so they sent me these to cheer me up. A: That's nice. Look, this postcard is from Beijing.

A. Just some postcards from friends.
B. Why not talk about it with your parents?
C. Where's this one from?
D. How did he go there?