发现水位低于正常值时，对照汽水流量，冲洗和校对各水位计，以检查其指示是否正确。
Compare with steam-water flowsmeter when water level drops below normal wash and calibrate indicators and check for correctness of readings ;
发现水位低于正常值时，对照汽水流量，冲洗和校对各水位计，以检查其指示是否正确。
Compare with steam-water flowsmeter when water level drops below normal wash and calibrate indicators and check for correctness of readings ;
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