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【简答题】
设X 1 ，X 2 ，X 3 相互独立，其中X 1 在[0，6]上服从均匀分布，X 2 服从正态分布N(0，2 2 )，X 3 服从参数为λ=3的泊松分布．记Y=X 1 -2X 2 +3X 3 ，则DY=( )
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A.
居延
B.
洪泽
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玄武
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云梦
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career
B.
disorder
C.
glorious
D.
killer
E.
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H.
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【单选题】Our physical and (1) well-being are closely linked. A number of minor (2), such as loss of sleep, may be (3) related to stress. These problems can become serious if people do not admit their importanc...
A.
career
B.
disorder
C.
glorious
D.
killer
E.
psychological
F.
realistic
G.
recovery
H.
reluctance
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