The optimum passagesection figure of rectangle is square, and the rectangle has 4 optimum comer circular arcs which make the hydraulic loss of friction loss of per unit length passage the least.
矩形流道断面以正方形为最优,且存在最优角圆,使单位长流道沿程水力损失最小。
2
In this section, there is a short passage with 5 questions or incomplete statements.
在本节中,有一篇短文,其中有5个问题或一些不完整的陈述。
3
Which section of a magazine is the passage probably from?