定常流
参考答案:
流场中任一点的流动参数(压力,速度和密度等)不随时间变化的流动。
The old town has narrow streets and small houses ________ are built close to each other.
A.they
B.where
C.what
D.that
学校食堂1周吃了385千克大米,照这样计算,一个月吃多少千克大米?(一个月按30天算)