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由多种精致的植物花粉和乳糖制得的营养保健花粉制品
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【单选题】若以 x 轴为键轴,下列何种轨道能与 p y 轨道最大重叠? -------------------------- ( ) (A) s (B) d xy (C) p z (D) d xz
A.
s
B.
d xy
C.
p z
D.
d xz
【简答题】设随机变量X，Y相互独立．都服从标准正态分布N(0，1)，求随机变量函数Z=X 2 +Y 2 ， 则Z的数学期望为多少？
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