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【单选题】
关于锅炉性能参数的以下说法中正确的是（ ）。A.
锅炉受热面积即炉水被加热产生蒸汽的面积
B.
炉膛容积热负荷高则炉膛内工作温度高
C.
蒸发率越高则效率越高
D.
使用时的工作压力绝对不许超过标示的名义工作压力
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【单选题】What does the professor mean when she says this?
A.
She thinks the student's view is quite right.
B.
She thinks the student's opinion is wrong.
C.
She is not sure about the student's opinion.
D.
She does not want to give her own opinion.
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