流体流动阻力有两种:摩擦阻力也称沿程阻力,及局部阻力。其中()阻力随水力半径的增大而()。
参考答案:沿程;减少
阅读短文,判断正(√)误(×)。
The panda lives in China. It lives in mountains. It lives in bamboo forests. The panda can climb trees and
eat bamboos. Now there are only 1000 pandas in China. They need nature parks.
( ) 1. The panda can't climb trees.
( ) 2. The panda lives in China.
( ) 3. The panda eats grass.
( ) 4. There are many pandas now.
( ) 5. The pandas need nature parks.
( ) 6. We should protect (保护) the pandas.
诸葛亮用兵往往都是料敌先机,用计取胜。第92回中“诸葛亮智取三城”中便是如此,试简述这一精彩的用计。