问题
问答题 简答题
假设某电梯运行速度为2m/s，轿厢顶部和对重顶部均有反绳轮，切机房无导向轮，试计算曳引绳的线速度。
答案
参考答案：
由题知该梯曳引比为2：1，也即V1/V2=2：1，所以，曳引轮线速度V1=2V2=4m/s。
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假设某电梯运行速度为2m/s，轿厢顶部和对重顶部均有反绳轮，切机房无导向轮，试计算曳引绳的线速度。
参考答案：
由题知该梯曳引比为2：1，也即V1/V2=2：1，所以，曳引轮线速度V1=2V2=4m/s。
| 阅读下面短文，请根据上下文意思及方框中所给单词、短语的适当形式填空。 | |
The American explorer, R.E Bird, became the first man to fly over the South Pole in 1929. He 1 a lot of photographs during the flight but then he 2 difficulties. His plane could not get over the mountains so he 3 his men to throw out heavy food sacks. The plane then 4 the mountains and 5 without further trouble. |