问题
单项选择题
一定量的理想气体由a状态经过一过程到达b状态，吸热为335J，系统对外做功126J；若系统经过另一过程由a状态到达b状态，系统对外做功42J，则过程中传入系统的热量为：（）
A.530J
B.167J
C.251J
D.335J
答案
参考答案：C
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一定量的理想气体由a状态经过一过程到达b状态，吸热为335J，系统对外做功126J；若系统经过另一过程由a状态到达b状态，系统对外做功42J，则过程中传入系统的热量为：（）
A.530J
B.167J
C.251J
D.335J
参考答案：C
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| During a recent vacation I visited Dusseldorf, a city in the dormer West Germany. The nine-day trip left a deep impression on me. I arrived at Dusseldorf airport at six. It was already dark outside. The first thing I needed to do was to find a place to 1 . I decided to telephone the youth hotel. But to use the 2 I needed some coins. I asked a lady for help. To my 3 , she 4 me five coins to use! But all the phones in the 5 needed phone cards. And phone cards could only be 6 at post office during the daytime. I was afraid I wouldn't be able to call the 7 . An old gentleman helped me. He couldn't speak English but 8 that I needed to make a phone call. He showed me where the 9 was and inserted (插入) his phone card. I called the youth hotel and found a place to stay that night. The kindness of the German people made me feel 10 and it seemed that I was not far from 11 . And my first day in Germany wasn't as 12 as I expected previously. Whenever I went, I asked people for 13 . What surprised me most was that almost every young German could tell me the way in 14 English. Older Germans couldn't speak English so well, 15 , they would try to help me whenever they could. One middle-aged man I asked for directions even 16 me to the place I was looking for. My experience in Germany completely changed my 17 of Germans. Before, I thought they were unfriendly to foreigners. In the World War II in the 1940s, Germans were always 18 . But things have 19 since then. And Germans today couldn't be more 20 , in my opinion. | ||||
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