问题
问答题 简答题
在通球清管过程中,出现球推力不足的原因是什么?
答案
参考答案:
输气管线内污水污物太多,球在高差较大的山坡上运行球前静液柱压头和摩擦阻力损失之和等于推球压差时,可引起球推力不足,使球不能推走污水而停止运行。
在通球清管过程中,出现球推力不足的原因是什么?
参考答案:
输气管线内污水污物太多,球在高差较大的山坡上运行球前静液柱压头和摩擦阻力损失之和等于推球压差时,可引起球推力不足,使球不能推走污水而停止运行。
用方框中所给单词的适当形式填空,使句子通顺、正确。每个单词限用一次。 | |
2. His parents were very _______ with him when he passed the final exam. 3. We are still _______ by Confucious' thoughts. 4. Which team will you play ________? No. 2 Middle School. 5. The Great Barrier Reef is one of the most famous _______ wonders in the world. |