题目内容
水泵调速运行的优点是
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实践证明,在切削限度内，叶轮切削前后水泵效率变化不大，因此切削抛物线也称
调速后的转速能与其临界转速重合、接近或成倍数
切削调节中叶轮的切削量是有一定限度的
A shop assistant is presenting a new model language translator to hercustomer. Listen to theconversation and choose the points the woman mentionsin her description.Language Translator Model Latest□Attractive shape □Weight:80g□Two colors □ Length: 12cm□ Safe to use □ Width: 6cm□ Easy to use □ Height: 3cm□ Advanced technology □ Power: 40w□ Reasonable price □ Languages: 5
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