问题 问答题 简答题

论述切丝机磨刀不锋利的原因。

答案

参考答案:

(1)刀片不进给,损耗的刀片无法补充,也无法磨刀,切丝后刃口自然钝化;

(2)刀片进给量过大,砂轮磨刀产生大量火花,磨刀产生的大量热量瞬时无法散开,在刀口处形成瞬时高温,使刀片退火变软,形成卷刃烧刀现象;

(3)砂轮不进给,砂轮磨不到刀片,刀片无法被刃磨,刀刃钝化;

(4)砂轮进给量过小,砂轮还没有完成一个往复磨刀循环,微小的进给量已经消耗尽,剩余的往复行程也无法磨刀,刀片也不会保持锋利;

(5)砂轮振动大,磨刀时多时少,磨刀不锋利;

(6)砂轮修整器的金刚石粒磨钝,修整的砂轮磨刀面不正常,磨刀也不会正常。

填空题

动词运用,必要时可加助动词或情态动词。

    My grandmother was an iron-willed (强硬的) woman. When I was five, she invited some friends to her

apartment. Among the guests there 1             (be) a rich man and his daughter. Grandmother considered

them the most important among the guests.

    During the party, I went to the bathroom. I was still sitting down when the girl walked in. "You 2             

(stay) here too long!"

    "It's not your business. Don't you know that little girls shouldn't come into the bathroom when a little boy 3             (use) it!?" I said in anger. This 4             (surprise) the little girl. Then she started to cry. Most

guests had heard what I said and laughed. But not Grandmother.

    She 5             (wait) for me when I left the bathroom. Grandmother shouted that I was impolite and rude

and ordered, "You 6              (say) sorry to her." All the guests watched in silence.

    Twenty minutes later, Grandmother walked by the bathroom and noticed a torrent (激流) of water

7              (run) out from under the door. Everyone knew who did that. Grandmother was so angry that she

tried 8              (get) file anyway. It took several strong men finally to move her away and calm her down.

    My grandfather took me by the hand and seated me on his lap. He looked at me, not at all angry or upset." 9             (tell) me," he asked, "why did you do it?"

    "Well, she shouted at me for nothing." I said seriously "Now she's got something to be angry at."

    Grandfather didn't speak right away. He just sat there, looking at me and smiling. I 10             never

_______ (forget) his expressions (表情) for my whole life. 

    "Eric," he said at last, "I think you did the right thing."

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