It's disbennifit to become protected film if change the velocity of flow frequently.

频繁改变水的流速不利于在冷却器材料表面形成保护膜，而保护膜对于防腐蚀是至关重要的。

Successive gaslift craft wants computation to be in charge of a shoe to be in contented stability to take the critical velocity of flow of fluid and critical flow.

连续气举工艺要计算管鞋处满足稳定带液的临界流速和临界流量。