理想的Rankine循环工质是在汽轮机中作（）膨胀
A.等温
B.等压
C.等焓
D.等熵
参考答案：D
The writer was so _______ in her work that she didn’t notice him enter the room.
A．abandoned
B．focused
C．absorbed
D．centered
采用工料单价法计价时，在计算完单位工程直接工程费后需再加上( )生成工程承发包价。
A．措施费
B．管理费
C．间接费
D．税金
E．利润
