constant volume test

例句：

1. 1.The constant volume test is used to measure the gas flow rate under steady-state conditions.
   恒定体积测试用于测量在稳态条件下的气体流量速率。
2. 2.During the constant volume test, the pressure and temperature are maintained at a constant level.
   在恒定体积测试期间，压力和温度保持在恒定水平。
3. 3. The constant volume test is crucial for understanding the behavior of gases under different conditions.
   恒定体积测试对于理解气体在不同条件下的行为至关重要。