皮皮学，免费搜题
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【单选题】
若随机变量X与y相互独立，且X在区间[0，2]上服从均匀分布，Y服从参数为3的指数 分布，则数学期望E(XY)等于( )。A.
4/3
B.
1
C.
2/3
D.
1/3
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皮皮学刷刷变学霸
举一反三
【多选题】Enjoy the song and choose the words you heard in the song.
A.
waiting
B.
breathe
C.
distraction
D.
think
E.
silent
F.
comfort
【简答题】Choose the words you hear from the following words .
【单选题】The words you choose have effects on whether you can ________ your ideas or not.
A.
stimulate
B.
formulate
C.
express
D.
form
【多选题】II F ill in the blanks with the words from the word bank. Write the number of the words you choose. “Yes, isn’t it lovely,” said Mary, looking at the black ridge ___1___. She was just ___2___ her brea...
A.
Happily
B.
Glistening
C.
joy
D.
Hurried
E.
at
F.
swept
G.
gleaming
H.
Wistfully
I.
of
J.
rim K. dread L. brim M. munching N. light O. surged
【简答题】Fill in the blanks with the words you choose. (请将你选择的词填进空里)
【简答题】Listen to the recording and choose the words you hear.
【简答题】If you are asked to describe yourself in 6 words, what are the six words you will choose, please choose the words from the following document and then tell me why you choose these 6 words. leave your ...
【简答题】麻花钻头颈部是工作部分与柄部的联接部分，供磨削时砂轮（）和打钻头（）用。
【简答题】Write down the words you choose。请写出所选单词。
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