题目内容
(请给出正确答案)
[单选题]
Seen () the eyes of a young friend Einstein was a simple,modest and ordinary man.
A.upon
B.through
C.with
D.in
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A.upon
B.through
C.with
D.in
设X1,X2,X3相互独立.且X1~U[0,6],X2~N(0,4),X3~P(2),Y=X1-2X2+3X3,求EY及DY.
设随机变量X与Y相互独立,且EX与EY存在,记U=max{X,Y},V=min{X,Y),则E(UV)=() (A)EU·EV. (B)EX·EY. (C)EU·EY. (D)EX·EV.
A. 93kPa
B. 269kPa
C. 124kPa
D. 156kPa
不含电源的部分电路欧姆定律的表达式是()。
A.I=U/R
B.I=Ey(R+r)
C.I=U2/R
D.I=E2/(R+r)
A.Eye
B.Ey
C.Yes
D.Eys
B、to be seen
C、being seen
D、seeing
A.Seen her two sisters-in-law off
B.Having seen her two sisters-in law off
C.With her two sisters-in-law seen off
D.By seeing her two sisters-in-law off
A.applied
B.demanded
C.owned
D.disagreed