【单选题】一Shall we buy some cards foe our teachers? 一Why not make some by ourselves? It will be much .
【判断题】对流传热的种类很多,按流动起因可分为强迫对流和自然对流;按流体有无相变可分为单相对流传热和相变对流传热;按流体的流态可分为层流、紊流和过渡流;按换热表面的几何形状分,可分为外掠平板强迫对流、管槽内强迫对流、外掠圆管强迫对流、外掠管束强迫对流、竖板自然对流、水平板热面向上自然对流、水平板热面向下自然对流、横管外自然对流、竖管外自然对流、水平夹层自然对流、竖夹层自然对流、膜状凝结传热、大容器沸腾等等。
【单选题】-Shall we buy some cards for our teacher? -Why not make some by ourselves? It will be much______
【单选题】一旦冷却水的流动达到湍流状态,冷却水便在管道内()运动。
【简答题】山脊的等高线应向____向凸出,山谷的等高线应向____方向凸出。
【单选题】-Shall we buy some cards for our teachers? -Why not make some by ourselves? It will be much________.
【简答题】情景交际。 A. Outside the park gate. B. Great. C. Let's make it a little earlier. D. Shall we go boating in the park? E. Where shall we meet? F. Nothing much. A: Hi, Jim! What are you going to do tomorrow?...
【单选题】在等高线地形图上,某处等高线呈弯曲状,若曲线向高处方向凸出时,该处的地形部位应是下列的 [ ]