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【单选题】
关于热功转换和热量传递过程,有下面一些叙述: (1) 功可以完全变为热量,而热量不能完全变为功; (2) 一切热机的效率都只能够小于 1 ; (3) 热量不能从低温物体向高温物体传递; (4) 热量从高温物体向低温物体传递是不可逆的. 以上这些叙述A.
只有 (2) 、 (4) 正确
B.
只有 (2) 、 (3) 、 (4) 正确
C.
只有 (1) 、 (3) 、 (4) 正确
D.
全部正确
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】气机失常引起眼病的病机主要是
A.
情志内伤,精血暗耗;情志失度,气机逆乱;情志抑郁,日久化火
B.
具有强烈传染性和流行性的致病邪气
C.
气虚气陷,气滞气逆
D.
伤气、伤血、伤精
E.
经络滞塞,目失濡养,邪循经入,致生目疾
【单选题】There was no_________ about it that they had got the news.
A.
affair
B.
doubt
C.
matter
D.
problem
【简答题】Instead of disturbing Cathy, the news had a strangely calming effect on her mind．
【简答题】简述表空间物理备份和恢复的步骤?
【单选题】No sooner _____ they rushed out into the street.
A.
did they hear the news than
B.
had they heard the news than
C.
did they hear the news when
D.
had they heard the news when
【简答题】The news that our school football team had won the matc h was inspiring.
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