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【判断题】
气环的主要作用是密封和导热,油环的主要作用是布油和刮油。A.
正确
B.
错误
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参考答案：
参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【多选题】下列关于条件熵的描述正确的是
A.
两个随机变量 X ， Y 的联合分布的熵
B.
条件熵 H(X|Y) 表示在已知随机变量 Y 的条件下随机变量 X 的不确定性
C.
H(X|Y)= H(X, Y) - H(Y) ，即条件熵 H(X|Y) 是 (X, Y) 的联合熵，减去 Y 单独发生包含的熵
D.
用于表征两个变量概率分布的差异性 。
【简答题】解下列不等式组：
【单选题】Maya has decided to apologize briefly in the buffer of her bad-news letter to a client. Which of the following is the best apology?
A.
We take full blame for your espresso machine malfunctioning and realize that it may have even eventually caused an injury.
B.
We apologize for any inconvenience this may have caused.
C.
We sincerely apologize for the problems you experienced with your espresso machine. To prevent recurrence of this problem, we will recalibrate the heating element at no charge to you.
D.
It is unfortunate that you are unhappy with your espresso machine.
【简答题】解下列不等式组：
【简答题】解下列不等式组：
【简答题】解下列不等式 (1)(x+5)/2+1>x-3 (2)-x/5+2/15 ≤-1 (3)x/3-2<1-x /5 (4)x-(3x-1) ≤x+2
【简答题】Listen to conversations about office facilities and choose the best answer to each question. 听三段对话,并选出每道题的答案。 Conversation 1 1) A. She missed a meeting. B. Her computer is not working. C. She lost an ...
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