Through tests and exploration, the cause of vacuumfluctuation in summer was found, in the direct air cooling unit, the output of vacuum pump had obvious influence on the variation of vacuum.
经过试验和探索，找到了夏季真空波动的原因，在直接空冷机组中，真空泵出力对真空的变化有明显的影响。
2
The general formula of phase fluctuation are given for the squeezed vacuum of Light. The properties of squeezed vacuum of light are found.