过热蒸汽在蒸汽透平中能量转换的过程是（）。
A、热能→动能→机械能
B、热能→动能→静压能
C、热能→机械能→动能
参考答案：A
When _____ back to Kaifeng when you arrived in Zhengzhou?[ ]
A. you came
B. did you come
C. do you come
D. came
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