题目内容
脑和脊髓的被膜分为____、____、____。
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硬脑膜窦包括____、____、____、____、____、____、____。
1. What is the email about?A. drawing a cell phone diagramB. determining the scale of a cell phoneC. choosing materials to make a cell phoneD. explaining a cell phone's dimensions2. Which is NOT true about the engineer’srequest?A. He wants different views of the phone.B. He wants to see what’s inside the phone.C. He wants to know the dimensions.D. He wants the drawing to be actual size.3. What can you infer about the company?A. It recently hired new engineers.B. It typically makes larger devices.C. It has never made cell phones before.D. It provides cost analysis to engineers.
某流体在两根几何尺寸完全相同的圆管内受迫流动换热，一管保持壁面温度均匀并恒定不变，另一管保持壁面热流密度均匀并恒定不变。若两管内流体的Re和Pr分别相等，此两管内的换热现象是（ ）
管槽内强制对流过程中入口段部分（ ）
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