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【单选题】
一燃气轮机装置,它由一台压气机产生压缩空气,之后分两路进入两个燃烧室燃烧吸热,燃气分别进入两台燃气轮机,其中燃气轮机1用来给压气机供给动力,燃气轮机2输出净功率为2000 kW。压气机进口空气状态为:p1=0.1 MPa,t1=27 °C;压气机的增压比为p=10;两台燃气轮机的进口燃气温度为t3=1180 °C。空气和燃气作理想气体处理,比热取定值,cp=1.004kJ/(kg×K)。整个过程为可逆过程。压气机的绝热效率为hC=0.85。整个装置的热效率为()。A.
35 %；
B.
40 %；
C.
45 %；
D.
50 %。
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【单选题】听力原文：M: It's a fine day today, isn't it? W: Yes. Let's go to the park, OK? M: That's great! Q: Where do they plan to go? (17)
A.
Park.
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Market.
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School.
【单选题】听力原文：W: Since it's the rush hour, let's take the subway. M: Ok. It's not as direct as tile bus, but it's faster and there will be less chance of a traffic: jam. Q: Why do the man and woman decide to t...
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It's more direct.
B.
It's faster.
C.
It's less crowded.
D.
It's less expensive.
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