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【单选题】
可用阴阳对立制约解释的是
A.
寒极生热
B.
阴损及阳
C.
热之
D.
重
E.
阳
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A.
η
B.
η>ηmax
C.
ηmin≤η≤ηmax
D.
ηmin
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【单选题】在由若干机器串联构成的机组中,若这些机器的单机效率均不相同,其中最高效率和最低效率分别为η max 和η min ,则机组的总效率η必有如下关系:
A.
ηmin
B.
η>η max
C.
η min ≤η≤η max
D.
η min max
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A.
Y
B.
N
C.
NG
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【单选题】According to the passage, Indo-European incursions caused Old European populations to ______.
A.
separate into different tribes
B.
move eastward
C.
change their ways of living obtaining food
D.
start recording historical events in Writing
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B.
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C.
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D.
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【单选题】In general,
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European economy will have a prosperous future.
B.
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C.
Europe is still the most powerful region in the world though facing some troubles.
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【单选题】以下哪项不是创业的本质?()
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创业是一种活动
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C.
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【单选题】在由若干机器串联构成的机组中，若这些机器的单机效率均不相同，其中最高效率和最低效率分别为ηmax和ηmin，则机组的总效率η必有如下关系：　　　　　。
A.
η
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C.
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【单选题】According to the passage, Indo-European incursions caused Old European populations to ______.
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separate into different tribes
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