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【单选题】
一通过长度为0.5 m的均匀激励的工作物质。出射是入射的两倍,则该物质的增益系数为
A.
4 m -1
B.
2 m -1
C.
2ln2 m -1
D.
1 m -1
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A.
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B.
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【单选题】Why didn’t you tell me about your trouble last week? If you ___ me, I could have helped.
A.
told
B.
had told
C.
were to tell
D.
would tell
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A.
challenge
B.
opportunity
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attempt
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notion
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【判断题】假设检验是用反证法进行检验的,即先承认假设正确,然后依据样本信息和概率分布原理判断这一结果的可能性有多大
A.
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B.
错误
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【简答题】A) heritage B) revision C) notion D) version
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【单选题】You needn t ______ the class to tell me that: you could have come up to me afterwards.
A.
have interrupted
B.
to have interrupted
C.
interrupt
D.
to interrupt
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【简答题】Define marketing research. How could a firm attempting to create new products use marketing research?
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【简答题】A) heritage B) revision C) notion D) version
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