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【单选题】
设X~N( 3, 2)，Y~U( 2, 8)，且X与Y相互独立，则D(2X–Y) =（）．A.
1
B.
5
C.
7
D.
11
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A.
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B.
Passive voice
C.
Non-finite forms of verbs
D.
None of the above
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A.
do
B.
not do
C.
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D.
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A.
so
B.
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C.
although
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