把热水器的水放光,把一个位置最低的水龙头开着,这样管道里就不会有任何压力,再把要换的阀门换了,重新开水阀门,点火.
把热水器的水放光,把一个位置最低的水龙头开着,这样管道里就不会有任何压力,再把要换的阀门换了,重新开水阀门,点火.
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