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【单选题】
设随机变量X和Y都服从标准正态分布,则()A.
X+Y服从正态分布
B.
服从 分布
C.
和 都服从 分布
D.
服从F分布
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】物体的三原色是什么?2. 什么是减色混合?
【单选题】It was unfortunate that, after so trouble-free an arrival, he should stumble in the dark as he was rising and severely twist his ankle on a piece of rock. After the first shock the pain became bearabl...
A.
he had sprained his ankle
B.
the parachute was very heavy
C.
it was pitch-dark there and the ground was hard
D.
there were less pine needles on the ground
【单选题】_____ alone in the dark room, the little girl was so frightened as to cry loudly.
A.
Leaving
B.
Left
C.
Having left
D.
To be left
【简答题】注塑模成型各步骤需要用到的注塑参数?请连线 预塑 合模 注射 保压 冷却 开模 顶出
【单选题】____ alone in the dark room, the little boy was so frightened as to cry.
A.
Leaving
B.
Left
C.
To be left
D.
Having left
【单选题】Jack didn't see the steps in the dark, so he ______ down.
A.
fell
B.
had fallen
C.
would fall
D.
was falling
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