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12psi

12psi

12psi

12psi

1

then , draw system pressure down to 12 psi (or other pre-set pressure ) and observe system for pressure build-up several hours later .

然后，将系统压力降到 12psi （或其他预定的压力），在压力逐渐恢复几个小时后再观察系统状态。

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