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【单选题】
维持蛋白质二级结构的主要化学建是 ?A.
疏水键
B.
盐键
C.
氢键
D.
二硫键
E.
肽键
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皮皮学刷刷变学霸
举一反三
【单选题】The passage suggests that the fact the 'only one community cancer cluster had ever been traced to an environmental cause' (Para. 3)is most likely due to the
A.
methodological difficulties in analyzing community cancer clusters
B.
reluctance of epidemiologists to investigate environmental factors in cancer
C.
lack of credibility of citizen activists in claiming to have identified cancer agents
D.
effectiveness of regulations restricting the use of carcinogens in residential areas
【单选题】_________ the fact that many drivers are ever trained, we cannot stress too much theimportance of traffic safety.
A.
Thanks to
B.
Despite
C.
As
D.
Although
【简答题】按《公约》规定卖方交货数量如超过合同规定数量时,( )
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