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【单选题】
卡诺热机在600K的高温热源和300K的低温热源之间工作，则热机的效率η为（）A.
0.5
B.
0.7
C.
0.8
D.
0.9
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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】在Windows XP中,菜单后有“...”符号表示( )。
A.
当前情形下已经被用户选择
B.
选择之后,会弹出一个相应的对话框
C.
该菜单项有下级子菜单
D.
该项已经被用户选择
【简答题】根据课文内容完成下面短文(注意括号中的提示)。 At the end of the 16th century, English was only spoken by people in England. They were native English speakers. However, 1______ English language has changed quite a lot over ...
【判断题】Marguerite was a sensitive girl and was upset by Momma’s behavior towards Mrs. Flowers.
A.
正确
B.
错误
【单选题】It is not enough only________ the rules of grammar if you want to learn English well.
A.
keeping in the mind
B.
to keep in mind
C.
to keep in your mind
D.
keeping in your mind
【简答题】企业一定期间的利润总额是指（）。
【简答题】__1__ the end of the 16 th century English was only spoken by people from England. They were the native _2___(speak). Today, __3__ largest number of people speaking English may be in China because a l...
【单选题】企业一定期间的利润总额是指( )。
A.
营业利润加投资收益
B.
营业利润加营业外收支净额
C.
营业利润加公允价值变动净损益
D.
营业利润加营业外收支净额减所得税费用
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