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【单选题】
听力原文：W: What did you think of the lecture? M: I thought it was very interesting. W: Did you really? M: Yes, didn't you? W: Certainly not. I thought he talked a lot of rubbish. M: So you think you know more than he does. W: Well, take coal for instance. W: What about it? M: Coal won't become important again. W: Why not? M: It's too dirty. They won't be able to find people to work down in coal mines in the future. W: They'll invent new kinds of machinery. M: Nonsense. The only sort of power they'll use in the future is atomic power. (12)A.
A film.
B.
A lecture.
C.
A tour.
D.
ATV program.
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皮皮学刷刷变学霸
举一反三
【单选题】对于任意两个随机变量 X 和Y, 若E(XY)=E(X)E(Y) , 则( )
A.
D(XY)=D(X)D(Y)
B.
X和Y独立
C.
D(X+Y)=D(X)+D(Y)
D.
X和Y不独立
【单选题】对于任意两个随机变量X和Y，若E(XY)=E(X)E(Y)，则有()。
A.
X和Y独立
B.
X和Y不独立
C.
D(X+Y)=D(X)+D(Y)
D.
D(XY)=D(X)D(Y)
【简答题】某学校举行演讲比赛，选出了10名同学担任评委，并事先拟定从如下4个方案中选择合理的方案来确定每个演讲者的最后得分（满分为10分）： 方案l 所有评委所给分的平均数． 方案2 在所有评委所给分中，去掉一个最高分和一个最低分，然后再计算其余给分的平均数． 方案3 所有评委所给分的中位数． 方案4 所有评委所给分的众数． 为了探究上述方案的合理性，先对某个同学的演讲成绩进行了统计实验．下面是这个同学的得...
【单选题】Refer to the exhibit. EIGRP had converged in AS 1 when the link between router R1 and R2 went down. The console on router R2 generated the following messages: *Mar 20 12:12:06: %DUAL - 5NBRCHANG E: IP...
A.
Incorrect bandwidth configuration on router R3 prevents R2 from establishing neighbor adjacency.
B.
Incorrect bandwidth configuration on router R 5 prevents R2 from establishing neighbor adjacency.
C.
Router R3 did not reply to the query about network 10.1.1.0/24 sent by router R2 .
D.
Router R5 did not reply to the query about network 10.1.1.0/24 sent by router R2 .
【简答题】试述胃的位置和分部。
【简答题】某学校举行演讲比赛，选出了10名同学担任评委，并事先拟定从如下4个方案中选择合理的方案来确定每个演讲者的最后得分（满分为10分）： 方案1 所有评委所给分的平均数． 方案2 在所有评委所给分中，去掉一个最高分和一个最低分，然后再计算其余给分的平均数． 方案3 所有评委所给分的中位数． 方案4 所有评委所给分的众数． 为了探究上述方案的合理性，先对某个同学的演讲成绩进行了统计实验．下面是这个同学的得...
【单选题】当温度为 20°C时,二极管的导通电压为0.7V ,若其他参数不变,当温度升高到 40°C 时,二极管的导通电压将( )。
A.
等于0.7V
B.
小于0.7V
C.
大于0.7V
D.
无法判断
【简答题】请说出人体胃的位置和分部？
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