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真空破坏器
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真空破坏器
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低真空保护
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vacuum breaker
真空破坏器
广泛应用于各种容易产生真空的系统,在系统形成负压的时候及时吸入空气从而保护系统的装置。又称真空破坏阀。
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soil vapor extraction
soil vertical pattern in China
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soil washing process
soil water
soil water characteristic curve
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soil water constant for irrigated grassland
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