题目内容
（ ）时效是指通过机械振动的方式来消除、降低或均匀工件内残余应力的工艺。
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常用的渗氮方法有气体渗氮法和离子渗氮法。
变形时效是指钢在冷变形后进行的时效。
Hot potato in the sentence the issue has become a political hot potato is equivalent to Chinese ____________________.
China has been an agricultural country and farming has been its way of life for thousands of years. Land plays a very important role in their life. The long-term experience of this aspect can be well reflected in the following idiom _____________.
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