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【单选题】
乙烯氧化生产环氧乙烷反应属于（ ）反应。A.
吸热
B.
放热
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【单选题】形成肺门阴影的主要解剖结构是:
A.
肺动脉、肺静脉、支气管、淋巴结
B.
肺动脉、上肺静脉、支气管、淋巴结
C.
肺动脉、上肺静脉、支气管
D.
肺动脉、肺静脉、淋巴结
E.
肺动脉、上肺静脉
【单选题】Members of Youth clubs are encouraged to participate ail of the following activities except______.
A.
sports
B.
cultural activities
C.
community service
D.
math competition
【单选题】Currently, almost ail the flagship chipmakers in that country are owned by American investors.
A.
Right
B.
Wrong
C.
Not mentioned
【单选题】The possible causes of the worldwide increase in kidnappings are ail the following EXCEPT that ______
A.
the kidnappers consider it a pleasure to do harm to the victims
B.
some rebel groups financed themselves through kidnapping
C.
foreign countries have invested little in the Third World
D.
the kidnappers know that frequently an insurance company will pay out big for the hostages
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