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【单选题】
刚体一般运动的自由度是：A.
6
B.
5
C.
4
D.
3
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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
B.
η>ηmax
C.
ηmin≤η≤ηmax
D.
ηmin
【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
【简答题】1 You must have said something to her, as she was crying after talking with you. A. defend B. offend C. confuse D. dire...
【单选题】European cultures generally value inner personal experience more than non-European cultures do.
A.
Y
B.
N
C.
NG
【简答题】听下面一段材料，回答第1-3 题。 1. Why was Paul angry with Jane? A. She told the others about his salary. B. She told Mrs. Wallace his salary. C. She always talks to everybody. 2. Why did Jane tell Mrs. Wallace the...
【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
【简答题】听下面一段材料，回答第1-3题。 1. Why is the man angry with the woman? A. She hasn't kept a place for him. B. She hasn't got any idea who he is. C. She hasn't given him a phone call. 2. How is the problem solved? A...
【单选题】In general,
A.
European economy will have a prosperous future.
B.
European economy is facing a recession.
C.
Europe is still the most powerful region in the world though facing some troubles.
【简答题】听下面一段材料，回答第1-3题。 1. Why was Paul angry with Jane? [ ] A. She told nobody about his salary. B. She told Mrs. Wallace his salary. C. She always talks to old people. 2. Why did Jane tell Mrs. Wallace...
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