An effective and energy saving heating system needs many control devices, such as flow controllers and differential pressure controllers.

每一个有效节能的供热系统都配有相应的调节控制设备，如自力式流量控制阀、压差控制阀等。

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But the water resource faces some problems such as flow reduction, flood and pollution.

但是，岷江上游的水资源面临着总体水量减少，洪水以及水体污染等问题。

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The artifacts such as flow gap, lower signal intensity on the veins had features about the shape and location.

静脉低信号和流动间隙伪影有形态和部位特点。

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So he also pays close attention to valuations, looking at metrics such as cash flow and earnings.

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Russell Croft, managers of the Croft Value and Croft Income funds, combine low earnings multiples with other indicators, such as cash flow, book value and debt-to-enterprise value.

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It uses so-called passive systems for cooling, such as the gravity flow of water and natural circulation based on thermodynamics.

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