City水管的压力很高,要保证把水送到每个地方。
每个房子都应当有稳压水阀,把City水压降到规定的数值。
City水管的压力很高,要保证把水送到每个地方。
每个房子都应当有稳压水阀,把City水压降到规定的数值。
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