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对于实际流体来说,雷诺数大于1500时,流体做湍流;雷诺数小于___1000__时,流体做层流。
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[音频]As technology is getting advanced, many products have been 1)to make life easier. With the help of modern technology, people's 2)has changed and their life is more 3). People use these new products not only to 4)but also their health, beauty and wealth. For example, mobile phones and smartphones have become important 5). Today everyone needs a mobile phone for 6). Computers play an important role in every field including hospitals, hotels, schools, and other 7). There are also mobile 8)like tablets and smartphones that can be used as a portable computer. These help people to get their 9) done through 10)a button.
丹麦天文学家第谷一生记录了大量天文资料，这属于经验方法中的（ ）方法。
科学探索需要把创新性的思维推理过程和严谨的科学验证相结合，不能偏重其一。
从事科研工作需要耐心和毅力，耐心细致的观察是获取科研真实资料的基础。
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