下列关于轴承表述错误的是( ) A .调心滚子轴承,主要承受径向载荷,可以承受较小的轴向载荷,多用于跨距大、弯曲变形大或多支点的轴 B .轴转速特别,球轴承代替滚子轴承或滑动轴承,因为球轴承启动阻力小,极限转速高 C . 6202 是深沟球轴承,直径系列代号是 2 ,内径为 15mm D .弹性挡圈常用于滚动轴承内圈的固定,高度应低于轴承内圈高度
A.
B.
C.
D.
D
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【单选题】D We keep animals as pets because they are attractive. We all have the urge to possess something that has aesthetic(审美的)value, and that is why we treasure paintings or fine furniture. Keeping pets is ...
A.
Pet-keeping has a very long history.
B.
Pet-keeping may do harm to animals.
C.
People keep pets for their aesthetic need.
D.
Caged pets become increasingly popular.
E.
Pet-keeping is helpful for children’s growth. B Pet-keeping is a time-honoured tradition. One of the reasons for people to raise dogs or cows was usefulness. While people in the past hunted animals and kept them in their backyards, the civilsed man today is less cruel towards them and is less exploitative(利用的).