[单选题] 下列哪种叙述给水中含油量超标的危害是错误的()。 A. 油质附着在受热面上分解而生成一种导热系数很小的附着物,危及锅炉的安全 B. 会促使锅水中生成漂浮的水渣和促进泡沫的形成,容易引起蒸汽品质的劣化 C. 含油的细小水滴若被蒸汽携带到过热器中,会因生成附着物而导致过热器损坏 D. 油与锅水中的碱性物质反应,会增加锅水的PH值
参考答案:D
热门试题:
第1题: [单项选择]肩关节脱位后弹性固定于肩外展()。 A. 10°~20° B. 20°~30° C. 30°~40° D. 40°~50° E. 50°~60° 参考答案:B
第20题: [单项选择]Questions 11 to 18 are based on the conversation you have just heard. A. Mary has never studied mathematics. B. Mary must be good at mathematics. C. Mary enjoys learning mathematics. D. Mary probably is poor at mathematics. 参考答案:D 答案解析:[听力原文] M: What’s the matter with Mary I thought she lost something since she is slow in reacting