问题
判断题
有一条管路管径为φ502.5mm，粘度为2mPa.S，流体的流速为2m/s，密度为1000kg/m3，则流体的流动类型一定是湍流。
答案
参考答案：对
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有一条管路管径为φ502.5mm，粘度为2mPa.S，流体的流速为2m/s，密度为1000kg/m3，则流体的流动类型一定是湍流。
参考答案：对
| 短文填空， 从下面方框中选出l0个单词，用它们的适当形式填入短文空格内，使短文意思正确、通顺。 | |
in Paris. It is 300 meters tall. It was designed and 2______ by Alexandre Gustave Eiffel many years ago for the Paris Universal Exposition. "Universal" here means "of the whole world", and "exposition" is a place where new 3______ new kinds of art and new kinds of food are displayed. Eiffel hoped that people could go to the top of the tower 4______, so he asked Elisha Otis to design an elevator. Unfortunately, the 5______ government did not like the first design 6______ Otis showed them, and they would not let him put the elevator in. In early 1889, the first visitors had to climb hundreds of stairs 7______ to the top. It's interesting that Eiffel 8______ lived in the tower where he had his own apartment. Although Eiffel designed the tower for people to visit, it was also for 9______ use. Now, the tower gets much more 10______ than another famous building-the Louvre (卢浮宫). |