问题
单项选择题
将工件加热到一定温度后，保温一定时间，然后______冷却下来的热处理过程称为退火，也称消除应力处理。
A．快速
B．中速
C．缓慢
答案
参考答案：C
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将工件加热到一定温度后，保温一定时间，然后______冷却下来的热处理过程称为退火，也称消除应力处理。
A．快速
B．中速
C．缓慢
参考答案：C
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| What do you do at the weekend? Some people like to 1 at home, but others like to go 2 a walk or play football. My friend Jack works hard in a factory during the 3 . At the weekend, he always 4 the same thing. On Saturday he 5 his car and on 6 he goes with his family to a village by car. His uncle and aunt have a farm there. It isn't a 7 one, but there's always 8 to do on the farm. The children help with the animals and give them their 9 . Jack and his wife help in the fields. At the end of the day, they are all 10 and Jack's aunt gives them a big meal. | ||||
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