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搜题
【单选题】
一定量理想气体与 300K 大热源接触做等温膨胀,吸热 Q=600KJ ,对外所做功为可逆功的 40% ,则系统的熵变Δ S= ( )。A.
-5KJ.K
B.
5KJ.K
C.
-2KJ.K
D.
2KJ.K
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【简答题】加强社会建设必须以（）为重点。
【单选题】Which of the following is the most formal?
A.
The analysis and findings of the experiment reveal that the technique is quite complex.
B.
We analyzed the experiment and what we found made us realize that the technique is quite complex .
C.
The analysis and findings of our experiment show that the technique is too puzzling.
D.
Our analysis and findings of the experiment make me puzzled.