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【单选题】
反应 CaCO 3 (s) → CaO(s)+CO 2 (g) ,在 298K 时, △ r H m θ =178.3kJ · mol -1 , △ r S m θ =159.0 J · mol -1 · K -1 ,则下列判断中正确的是( )。A.
因为此反应是吸热的，故在任何条件下均不能自发进行
B.
因为是熵增的，在 298K 自发进行
C.
此反应在 298K 、标准态时不能自发进行，但当温度升高到一定值时，可自发进行
D.
若降低温度，该反应可自发进行
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知识点：
皮皮学刷刷变学霸
举一反三
【单选题】下列说法错误的是
A.
单位冲激信号是单位阶跃信号的一阶导数；
B.
确定信号在定义域内任意时刻都有确定的函数值；
C.
系统的输入输出描述法不仅关心系统的输入和输出，也涉及到系统的内部组成 ；
D.
非因果系统是一种理想的模型，在现实生活中并不存在 。
【单选题】What is the main purpose of the lecture?
A.
To introduce a method that can help students remember new information
B.
To introduce a way to study how information passes from one person to another
C.
To explain the differences between biological information and cultural information
D.
To explain the differences between stories, songs, and other pieces of information
【简答题】What is REM?
【简答题】My version(视力) is getting worse. I can’t even see what is five feet away from me without glasses. ① 我拒绝戴眼镜 ，though I know I need to. I’m afraid they will make me look ugly. Besides, I can do well with...
【简答题】What usually appears when cooking is almost finished and steams comes out? The remaining ________________.
【单选题】- Hello!May I speak to David? - _____ I’ll go and find him. [ ]
A.
What on earth is that?
B.
Oh, you remembered!
C.
Can I take a message?
D.
Hold the line, please!
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