求翻译：is approximately 15 psig (1 bar) higher than the standby side. Rotating the knob to point to the standby side, changes the pressure differential是什么意思？

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悬赏分：1 - 离问题结束还有

is approximately 15 psig (1 bar) higher than the standby side. Rotating the knob to point to the standby side, changes the pressure differential

问题补充：

匿名	2013-05-23 12:21:38

匿名	2013-05-23 12:23:18

匿名	2013-05-23 12:24:58

匿名	2013-05-23 12:26:38

匿名	2013-05-23 12:28:18

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