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【单选题】
关于可逆过程和不可逆过程的判断: 1 可逆热力学过程一定是准静态过程. 2 准静态过程一定是可逆过程. 3 不可逆过程就是不能向相反方向进行的过程. 4 凡有摩擦的过程 , 一定是不可逆过程. 以上四种判断,其中正确的是
A.
1，2，3
B.
1，2，4
C.
2，4
D.
1，4
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仲裁分析与例行分析
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【单选题】Many girls go to your house. They bring all their pet dogs. In all, there are 22 heads and 72 feet. How many girls and dogs are there in the room? [     ]
A.
6 girls and 16 dogs
B.
7 girls and 15 dogs
C.
8 girls and 14 dogs
D.
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A.
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