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【单选题】
按照认知心理学的观点，机械学习有意义学习划分的主要依据是（）A.
新旧知识是否建立非人为实质性的联系
B.
学习是否主动学习，反复练习
C.
要学习主要内容是教师呈现还是由学生发现
D.
学习的目的是解决问题还是获得知识
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皮皮学刷刷变学霸
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【单选题】大数据的利用过程是 （ ）
A.
采集——挖掘——清洗——统计
B.
采集——统计——清洗——挖掘
C.
采集——清洗——统计——挖掘
D.
采集——清洗——挖掘——统计
【单选题】In the doctor's view,_________
A.
there are both advantages and disadvantages of being rich.
B.
traveling a lot will be beneficial to children.
C.
rich children usually.have little confidence in themselves.
D.
rich kids are often short of money because of their life of luxury.
【简答题】Compare several of the key advantages and disadvantages of observation and survey research.
【简答题】设光纤的纤芯折射率n1=1.500,包层折射率n2=1.485。求: (1)相对折射率差Δ; (2)数值孔径NA; (3)入射临界角θmax 。
【多选题】Choose the several key advantages of nanocarriers over conventional, molecular agents in medicine.
A.
They enable stable aqueous dispersions of active, but poorly water soluble molecular agents, for delivery.
B.
Nanocarrier should exhibit no toxicity and be safely excreted from the body.
C.
Their composition, size, shape, and suce properties can be tailored so that, they can protect the encapsulated agents from degradation.
D.
Nanocarrier matrix can be designed for controlled release of drugs at target areas for optimal and sustained drug action.
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