The pre-pressure water shock tube dynamic calibration method is put forward.

提出了预压水激波管动态校准方法。

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At the first pre-pressure water pump outlet pipe above the water level in the tank water level.

在第一次供水前压力罐内水位高于水泵出水管水位。

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According to flow in a different, balanced spool valve the pressure can be pre-pressure, can also be a back pressure valve.

根据流向不同，平衡阀芯所受的压力可以是阀前压力，也可以是阀后压力。

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And to pre-empt pressure for a fresh vote, Mr Fujimori has started a charm offensive.

ECONOMIST: Peru

Cynics, and there are plenty of them in Syria, dismiss the resolution as one of a series of gestures to pre-empt pressure from America, pressure that has been intensified by the uncomfortable proximity of American forces in Iraq.

ECONOMIST: Arab democratic reform

For the refugee camps in the east, supply lines to the land-locked country are already under pressure as pre-positioning of food starts ahead of the rainy season.

ECONOMIST: Chad: The aftermath | The