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关闭燃油加热器的蒸汽阀。
Close the steam valve of the fuel oil heater.
youdao
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应该安装蒸汽安全阀，为设备提供紧急保护。
Steam safety valve should be installed to provide emergency protection of equipment.
youdao
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应该安装蒸汽安全阀，为设备提供紧急保护。
Steam safety valve should be installed to provide emergency protection of equipment.
youdao