题目内容
（请给出正确答案）
[主观题]
As a matter of fact，what impressed me most is Einstein‘s ，but not his photoelectric t
heory for which he won the Nobel Prize.()
A.character
B.temper
C.quality
D.personality
提问人：网友陈银桑
发布时间：2022-01-07
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Suppose a discrete random variable
has mean
and the moment generating function
, for all
, where
and
are unknown constants, then the values of
andare
A、
and
B、
and
C、and
D、
and
