题目内容

理想流体定常流动，流线与迹线重合。()

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如果流场中若干流体微团无绕自身轴线旋转运动，刚称为无旋流动。()

不可压缩流体的有旋流动由于存在速度势和流函数，故又称为位势流动。()

听力原文：What can we learn from the short passage？
What can we learn from the short passage？
Mrs. Rumbold did talk__________at dinner.

听力原文：What did the woman do when I took my seat beside her？
What did Mrs. Rumbold do when I took my seat beside her？
She did not even__________at me.