有A个相互独立的标准正态分布随机变量z1、z2、…zn，z1 2+z2 2+…+...

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【简答题】

有A个相互独立的标准正态分布随机变量z1、z2、…zn，z1 2+z2 2+…+ zn 2的分布

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举一反三

【单选题】The boy doesn’t speak his sister, but his written work is very good.

as well as

so good as

much better than

much worse than

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【单选题】The boy doesn't speak _____ his sister, but his written work is very good. [ ]

as well as

so good as

more better than

more worse than

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【单选题】一幅地形图的编号为J-35-25-(45),则其比例尺应为()

1:10万

1:5万

1:1万

1:2.5万

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【判断题】化学反应是独立于反应器模块或塔模块的,不可以同时应用于多个模块中。

正确

错误

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【单选题】The boy is so good a student _____ I've never seen before.

which

that

so that

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【简答题】根据首字母和汉语提示填入恰当的单词。 1. 'Show me your d____ license.' 'Here you are.' 2. The boy is so s____ that he falls asleep in class. 3. It's a very difficult dream to a . 4. Sbe tried to stop smoking, and she s_...

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【简答题】Oh, boy! Time for a now． oldest brother is the seeker so k have to hide extra good because he’s smart and will find me quickly．But where? Behind the garage won’t work. The barn is too easy. Wait,...

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【单选题】一幅比例尺为 1 : 10 万的地形图,其比例尺精度为( )。

1 m

10 m

100 m

0.1m

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【单选题】有如下接口和类定义:interface Info{String getInfo(int a, int b);}public abstract class Student implements Info{}以下可以在类Student中正确定义的方法有哪两项

public String getInfo(int m, int n){…}

public void getInfo(int m, int n){…}

protected String getInfo(int m, int n){…}

public abstract String getInfo(int c, int d);