锅炉使用单位在锅炉检修时应按照 DL/T561《火力发电厂水汽化学监督导则》对省煤器、锅筒、水冷壁、过热器、再热器等部件的腐蚀、结垢、积盐等情况进行检查和评价。
1、正确正确
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Theeldestchildisthoroughly（）becausetheyalwaysgivehimwhateverhewant.
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Aleading___________intelligenceandoperationscompanyhasreleaseditsanalysisofworldwidereportedincidentsofpiracyandcrimeagainstmariners.
Nowhereinnatureisaluminumfoundfree,owingtoitsalways____withotherelements,mostcommonlywithoxygen.
