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【单选题】
若E(X1)和E(X2)表示连续型随机变量X1和X2的期望函数，以下哪一项性质不成立（）A.
E(aX1+b)=aE(X1)+b
B.
E(X1+X2)=E(X1)+E(X2)
C.
E(X1*X2)=E(X1)*E(X2)
D.
E(aX2+b)=aE(X2)+b
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举一反三
【单选题】—You mean I have to go there by myself, for you are not free. —Yeah, . [ ]
A.
you mean it
B.
you think it
C.
you got it
D.
you did it
【多选题】三人搬运患者上厂平车的正确方法为（）
A.
推平车至患者床旁，小轮端靠近床尾，使平车与床成钝角，将制动闸止动
B.
搬运者甲双手托住患者头、颈、肩及胸部
C.
搬运者乙双手托住患者背、腰、臀部
D.
搬运者丙双手托住患者膝部及双足
E.
三人同时抬起患者稳步向平车处移动，将患者放于平车中央
【简答题】VI设计基础部分
【单选题】Which of the following mean shares the same meaning with that in "If you really don't mean them when you say them?"
A.
Why are you so mean to me?
B.
I mean to call on you tomorrow
C.
What does this word mean?
D.
Spending too much now will mean a shortage of cash next year
【单选题】In Pakistan, marrying without parental approval can mean ____________ from one’s family.
A.
being completely cut up
B.
to be completely cut off
C.
to be completely cut up
D.
being completely cut off
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