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【单选题】
船舶锅炉炉水的硬度是指（）浓度。A.
OH离子
B.
钙离子
C.
镁离子
D.
钙、镁离子
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反馈参考答案：
举一反三
【判断题】The deciding factors in choosing whom to work with on a project are efficiency and likeability.
A.
正确
B.
错误
【简答题】Corr thinks that if there is any problem with a drug, ifs better to know it ______.
【单选题】They were choosing building stones less _______________than marble or granite.
A.
brittle
B.
frail
C.
fragile
D.
friable
【简答题】Nanoparticles that are naturally occurring (e.g. volcanic ash or soot from forest fires) or are the incidental byproducts of combustion processes (e.g. welding, diesel engines) are usually physically ...
【简答题】我国古代数学家张丘建在《算经》一书中提出的"百钱百鸡问题":鸡翁一值钱五,鸡母一值钱三,鸡雏三值钱一。百钱买百鸡,问鸡翁、鸡母、鸡雏各几何?
【判断题】Nanoparticles that are naturally occurring (e.g. volcanic ash or soot from forest fires) or are the incidental byproducts of combustion processes (e.g. welding, diesel engines) are usually physically ...
A.
正确
B.
错误
【单选题】股票之间的相关系数如下：Corr(A，B)=0.85；Corr(A，C)=0.60；Corr(A，D)=0.45。每种股票的期望收益率为8%，标准差为20%。如果投资者的全部资产现在由股票A组成，并且只被允许选取另一种股票组成资产组合，投资者将会选择( )。
A.
B
B.
C
C.
D
D.
B或C
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