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【单选题】
设随机变量 服从泊松分布 ,则其数学期望为( ).
A.
;
B.
;
C.
;
D.
.
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参考答案:
举一反三
【单选题】In 89 BC, Pompeii became a rich and busy city and near the city ____ a volcano.
A.
be
B.
being
C.
had
D.
Was
【单选题】用来衡量心界增大与否及增大程度常用的垂直成为
A.
前正中线
B.
锁骨中线
C.
腋前线
D.
胸骨缘
E.
腋前线
【简答题】What does Kirsty feel about the city? [A]It is a big and busy city. [B]It is so frightening. [C]It is really great city.
【单选题】雨后看到的彩虹,下列说法错误的是( )
A.
是一种色散现象
B.
是一种折射现象
C.
是一种散射现象
D.
雨后空中漂浮着很多小水滴,这些小水滴就似三棱镜,太阳光经过小水滴两次折射后分解成七色光
【单选题】下列施工成本管理活动或文件中,属于施工项目降低成本的指导文件及设立目市故本依据的是( )。
A.
施工成本核算
B.
施工成本分析
C.
施工成本计划
D.
施工成本管理
【单选题】)Beijing is one of the ______ in the world today.
A.
busiest city
B.
busiest cities
C.
busy city
D.
busy cities
【单选题】What does Kirsty feel about the city?
A.
It is a big and busy city.
B.
It is so frightening.
C.
It is really great city.
【单选题】下列施工成本管理活动或文件中,属于施工项目降低成本的指导文件及设立目标成本依据的是( )。
A.
施工成本预测
B.
施工成本分析
C.
施工成本计划
D.
施工成本核算
【单选题】In the 1700s Savannah became a busy port city for exporting farm products and a city with lot of banks.
A.
Y
B.
N
C.
NG
【单选题】Linda has made an appointment _____David. [     ]
A.
for
B.
from
C.
with
D.
to
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