问题
单项选择题
汽车修理中挤压强化用于（）的加工。
A、曲轴曲柄圆角
B、内孔
C、气门
D、连杆
答案
参考答案：B
搜题请搜索小程序“爱下问搜题”
汽车修理中挤压强化用于（）的加工。
A、曲轴曲柄圆角
B、内孔
C、气门
D、连杆
参考答案：B
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| When you take a walk in a town in a western country, you'll often see people walking 1 their dogs. It is still true that a dog is 2 animal in the world, but the reason why people 3 a dog has changed. Once a upon a time, a man met a dog and wanted it to help him in the fight 4 other animals and he found the dog 5 him and did what he told him 6 . Later people used dogs for hunting 7 other animals, and the dogs did not 8 what they got until their masters agreed. So dogs were used for 9 sheep and guarding chickens. But now the people in the towns and cities 10 dogs to fight other animals for them. Why do they keep dogs? Of course, they keep them to 11 thieves, but the most important reason is 12 people feel 13 in the city. For a child, a dog is his 14 friend when he has no friends to 15 . For a young wife, a dog is her 16 when she does not have her own. For old people, a dog is also a child when their 17 children have grown up and 18 . Now people do not have to use a dog, but they keep it 19 a friend, just like a member of the 20 . | ||||
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