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【单选题】
合作性问题有其固定的陈述方式,其简写为A.
PE：ⅹⅹⅹ
B.
PES ：ⅹⅹⅹ
C.
DC ：ⅹⅹⅹ
D.
P：ⅹⅹⅹ
E.
PC ：ⅹⅹⅹ
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举一反三
【简答题】设随机变量X的分布律为 X -2 0 2 P 0.4 0.3 0.3 求EX，E(2X-1)和EX 2
【简答题】设随机变量X的分布律为P{X=k}=1/4(k=1，2，3，4)，函数Y=eosπX．求二维随机变量(X，Y)的联合分布律．
【单选题】设随机变量X的分布律为 X -2 0 2 P 0.3 0.2 0.5 则Y=|X|的分布列为( )
A.
X 2 0 2 P 0.3 0.2 0.5
B.
X 0 2 P 0.2 0.8
C.
X -2 0 2 P 0.09 0.04 0.25
D.
X 0 2 P 0.04 0.14
【简答题】It can be inferred that Charles Francis Adams ,Jr. [A] devoted his later years to classical education. [B] was an advocate of education in history. [C] was an opponent to classical education. [D] regr...
【多选题】Bronze ware was a unique national treasure because of ( )
A.
impressive designs
B.
classical decorative ornamentation
C.
priceless lightness
D.
wealth of inscriptions
【单选题】Advertising companies are always having to think up new ways to __________ products.
A.
design
B.
classify
C.
promote
D.
identify
【单选题】Passage Two
A.
The difference between classical music and rock music.
B.
Why classical music is popular with math students.
C.
The effects of music on the results of math tests.
D.
How to improve your reasoning ability.
【简答题】设随机变量X的分布律为 X 0 1 2 3 P 0.1 A 0.3 0.2 求(1)常数A；(2)P(0.5≤X＜2)．
【单选题】This passage mainly discusses _____.
A.
causal reasoning
B.
various types of reasoning
C.
classification of cause
D.
the causal process
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