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【简答题】
已知某随机变量X服从参数为λ的指数分布,设 , ,..., 是子样观察值,求λ的矩估计。
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反馈参考答案：
举一反三
【单选题】There is milk here，but there are glasses. [ ]
A.
little；a few
B.
few；a few
C.
little；a little
D.
few；a little
【简答题】You will not be able to wash yourself here for a few days.
【单选题】----Can I have ________? ---- Of course .Here you are.
A.
some more cakes
B.
a few food
C.
quite a few food
D.
a little eggs
【单选题】─How long will you stay here? ─I think I will be here for _____ more days. [ ]
A.
few
B.
a few
C.
little
D.
a little
【单选题】At the beginning of the war, what did the Russians do in face of Napoleon’s offensive?
A.
They fought fiercely.
B.
They avoided direct fighting.
C.
They surrendered after fierce resistance.
D.
They tried to negotiate with the enemy.
【单选题】The meeting will start in a few minutes. You're______to be here a few minutes earlier.
A.
asked
B.
told
C.
allowed
D.
supposed
【简答题】锌钡白是BaSO 4 和ZnS的混合物，ZnS难溶于水。某化工厂用重晶石为原料制备锌钡白，生产过程中会产生大量废气（主要成分为CO 2 、CO及少量SO 2 和硫蒸气等），为防止污染空气并提高原料利用率，生产中采用下述工艺流程 请根据上述流程回答下列问题： （1）重晶石的化学式为_____，锌钡白可用于调制_____色和浅色油漆。 （2）处理过程的步骤为：①__________；②洗涤；③____...
【简答题】锌钡白是BaSO 4 和ZnS的混合物，ZnS难溶于水。某化工厂用重晶石为原料制备锌钡白，生产过程中会产生大量废气(主要成分为CO 2 、CO及少量SO 2 和硫蒸气等)，为防止污染空气并提高原料利用率，生产中采用下述工艺流程： 请根据上述流程回答下列问题： (1)重晶石的化学式为_________，锌钡白可用于调制_______色和浅色油漆。 (2)处理过程( a )的步骤为：①________...
【简答题】By the 17th century a few public libraries had ________.
【单选题】____with this fiercely competitive society, _____English well and you will succeed.
A.
Faced, master
B.
Faced, mastering
C.
Having faced, master
D.
To face, mastering
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