问题
问答题 简答题
电力机车比较理想的齿轮材料应具备哪些条件？
答案
参考答案：
理想的齿轮材料应具备的条件为：
（1）齿面应具有足够的硬度
（2）齿芯应有足够的韧性
3）良好的加工性能和经济性
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电力机车比较理想的齿轮材料应具备哪些条件？
参考答案：
理想的齿轮材料应具备的条件为：
（1）齿面应具有足够的硬度
（2）齿芯应有足够的韧性
3）良好的加工性能和经济性
Today is September 1st. It is day of school. Little Tommy is very because he can see his friends again. He wants to meet his new teachers. He gets up very early. After having his , he goes to . At about 7:20, he gets to school. He his friends on the playground. They talk with each other happily. Then it is time for class. Everyone to the classroom. Their new English teacher comes into the classroom. Her is Linda Green. She is only twenty old, but she teaches very well. They think she is a good teacher. They all her.
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