某化学反应在烧杯中进行,放热2000J,若设计在电池中进行,该系统做电功800J,若两过程的始终态相同,而且不做体积功,在电池中进行反应的Q(单位:J)为()。
A. )-1200
B. 1200
C. -2800
D. (D)2800
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在孤立系统内()
A. 热力学能守恒,焓守恒
B. 热力学能不一定守恒,焓守恒
C. 热力学能守恒,焓不一定守恒
D. 热力学能、焓均不一定守恒
在一个密闭绝热的房间里放置一台冰箱,将冰箱门打开,并接通电源使冰箱，。过一段时间之后,室内的平均气温将()
A. 不变
B. 升高
C. 降低
D. 无法判断
Question 1[音频]
A. They like the lifestyle at the beginning of the 1960s.
B. They are inspired by the entertainment of the 1960s.
C. They are big fans of famous actresses in the 1960s.
D. They are likely to dress like people in the 1960s.
Question 2[音频]
A. They are brightly colored.
B. They are in honor of the movie The Godfather.
C. They are noodles popular in the 1970s.
D. They are served on bright green leaves.
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