皮皮学，免费搜题
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【多选题】
哪些属于投资组合的风险来源( )A.
经济周期
B.
利率
C.
企业人员变动
D.
产品研发成功与否
拍照语音搜题，微信中搜索"皮皮学"使用
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【简答题】选择信息收集的方法一般分四中:_________、_________、_________、_________。
【单选题】采用成组设计t检验的条件是:
A.
样本均数与总体均数的比较,总体标准差 已知且样本含量较小( )
B.
样本均数与总体均数的比较,总体标准差 未知且样本含量较小( )
C.
两样本均数比较,两样本差值来自正态总体并且差值的总体均数为0
D.
两样本均数比较,两样本均来自正态分布总体,且两样本总体方差相等
E.
两样本均数比较,两样本均来自正态分布总体,且两样本总体方差已知
【单选题】How do drugs help people stop smoking work?
A.
They act on smokers' brain.
B.
They fight against nicotine directly.
C.
They have the same effect on dopamine as nicotine does.
D.
They counteract the effect on dopamine made by nicotine.
【单选题】Paul tried to provoke Fletch into a fight.
A.
Dairy products may provoke allergic reactions in some people.
B.
The dog would not have attacked if it hadn't been provoked .
C.
Shutdowns by big employers will provoke a chain reaction among suppliers and cause a spike in joblessness.
【简答题】I tried to fight against my desire to eat chocolate, but I couldn’t. (go against) 改为:
【单选题】The two dogs started to fight, so we tried to _____ them.
A.
split
B.
separate
C.
tear
D.
divide
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