题目内容
1.轴承7203的内径是15mm。
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2.角接触轴承既使受纯径向载荷,也会产生轴向分力。故角接触轴承必须成对使用,以抵消其内部轴向力。
3.深沟球轴承接触角为00，实际工作中只能承受纯径向力，不能承受轴向力。
4.滚动轴承型号31215/P52,其中精度等级为2级，游隙组为5组。
We often hear parents ___1___ their children or teachers ___2___ their students for daydreaming. People usually take a ___3___ ___4___ towards daydreaming because they think daydreaming is a waste of time and an ___5___ from real life. Well, daydreaming may sometimes be a ___6___ of time or an escape, but daydreaming can also ___6___ us a lot of good.
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