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【单选题】
某理想气体经等温膨胀,绝热膨胀,等温压缩,绝热压缩的循环过程后回到初态,系统内能的增量是 。A.
U=0
B.
U>0
C.
U<0< /div>
D.
U 0
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【单选题】_____ the _____ of modern industry, the pollution is becoming more and more serious.A．With; deve
A.
44. _____ the _____ of modern industry, the pollution is becoming more and more serious. A．With; developing
B.
Under; development
C.
With; development
D.
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