问题
问答题 简答题
钢轨的化学成份对钢轨有什么影响？各类元素对钢轨的性能具有哪些影响？
答案
参考答案：
钢轨的组织与性能，主要取决于它的化学成分。合适的化学成分是保证钢轨质量，提高钢轨的机械性能的主要因素之一，而钢材冶金过程中难以除去的有害元素，又对钢材性能产生不良的影响。钢轨中除铁以外的主要元素对钢轨性能影响见下表：
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钢轨的化学成份对钢轨有什么影响？各类元素对钢轨的性能具有哪些影响？
参考答案：
钢轨的组织与性能，主要取决于它的化学成分。合适的化学成分是保证钢轨质量，提高钢轨的机械性能的主要因素之一，而钢材冶金过程中难以除去的有害元素，又对钢材性能产生不良的影响。钢轨中除铁以外的主要元素对钢轨性能影响见下表：
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| At the age of six, I was paying a visit to my grandfather's farm in Kansas.Grandpa had sent me into the __1__to gather pecans(美洲山核桃)for us to enjoy later. Picking pecans was not an easy job and my basket was only half full.I wasn't about to __2__Grandpa down.Just then something caught my __3__.A large brown squirrel was a few feet away.I watched as he picked up a pecan, hurried to a tree and __4__in a large hole in the trunk.A moment later the squirrel __5__out and climbed down to the ground to pick up another nut.Once again, he took the pecan back to his hiding place. Not so __6__anymore, I thought.I dashed over to the tree and looked into the hole.It was __7__ with pecans!Golden pecans were right there for taking.This was my __8__.Handful by handful, I scooped all of those pecans into my basket.Now it was full!I was so __9__of myself.I couldn't wait to show Grandpa all the pecans.Therefore, I ran back and shouted, "Look at all the pecans!"He looked into the basket and said, "Well, well, how did you find so many?"I told him how I'd __10__the squirrel and taken the pecans from his hiding place. Grandpa praised me for being smart in observing the squirrel and his habits.Then he did something that __11__me.He handed the basket back to me and put his arm gently around my shoulders. "That squirrel worked very hard to gather his winter __12__of food, "he said."Now that all of his pecans are gone, don't you think that little squirrel will __13__ the cold winter?" "I didn't think about that, "I said. "I know, "Grandpa said."But a good man should never take advantage of someone else's hard work." Suddenly I felt a bit __14__.The image of the starving squirrel wouldn't leave my mind.There was only one thing I could do.I carried the basket back to the tree and poured all the nuts into the hole. I ate no pecans that night, but I had something much more fulfilling-the __15__of knowing I had done just the right thing. | ||||
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