锉刀用碳素工具钢T10A、T12A或T10、T12、T13制成,并经过热处理(),锉刀的()在HRC62~67之间。
参考答案:淬硬、硬度
短文改错
Dear Elli,
I am a senior student. I like make friends with people and I do my best to get well with everyone. But last week I had found out that one of my friends wrote their diary ,saying that she disliked me she doesn’t want to be my friend any longer, And
now she has started making fun of me because of I’m fat. I’m kind to her but why can’t she be friend to me? As for lose the discouraging weight, should I do more exercise? Use pills? And do you know any other ways? Please give me some advices.
四油楔轴承热点是楔形是对称的,轴可以逆转,但其只适用于低速重载的情况