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【单选题】
OPEC代表的市场结构是( )A.
纯垄断模式
B.
不完全竞争下的寡头勾结垄断模式
C.
垄断竞争
D.
完全竞争模式
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【简答题】选词填空time for reach for at the moment team invite appetite come across put up pastime beware 1.The 2008 Beijing Olympic s were such a good _____________ the world to know more about China. 2.Sorry,...
【单选题】To keep the aircraft from moving while it is on the jack， the wheels that are not jacked should be securely ____________.
A.
blocked
B.
clogged
C.
chocked
D.
stopped
【简答题】选词填空。 It's What's A: ___________ this? B: ___________ a desk.
【单选题】The four-wheeler was lost to sight, the sound of the slow wheels ().
A.
died away
B.
died off
C.
dying away
D.
dying off
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