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【判断题】
设(X,Y)服从二元正态分布，X~N(1,4)，Y~N(0,1)，且X与Y不相关，令Z=2X-Y+1,则Z~ N(3, 15).A.
正确
B.
错误
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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.
A.
as well as
B.
so good as
C.
much better than
D.
much worse than
【单选题】The boy doesn't speak _____ his sister, but his written work is very good. [ ]
A.
as well as
B.
so good as
C.
more better than
D.
more worse than
【单选题】The boy is so good a student _____ I've never seen before.
A.
which
B.
as
C.
that
D.
so that
【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_...
【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,...
【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
A.
public String getInfo(int m, int n){…}
B.
public void getInfo(int m, int n){…}
C.
protected String getInfo(int m, int n){…}
D.
public abstract String getInfo(int c, int d);
【单选题】It was so quick and easy. A fourteen-year-old boy in Scottsdale, Arizona, put his $50 bill on a color copying machine. Within seconds he transformed $50 into $550, and he was ready to shop.Twenty year...
A.
most children above the age of 14 can fake money
B.
new high technology makes money faking easier
C.
anyone who has a computer can fake money
D.
casual faking machines are called casual for the reason that no skills and planning are required
【单选题】The little boy is only six years old, he can make good model cars. [ ]
A.
but
B.
so
C.
or
D.
and
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