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【单选题】
下列哪一种对原电池的叙述是错误的 :A.
一种将化学能转换为电能的装置
B.
一种可以将氧化还原反应分开进行的装置
C.
通过原电池进行的反应 ， 反应物和产物可以是相同的物质
D.
随着电池反应的进行 ， 两电极的电极电势不一定随时间而变化
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【单选题】There are scientific proofs that the alcohol-addicts are ______ to heart attack.
A.
infectious
B.
eligible
C.
accessible
D.
prone
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【简答题】American researchers say drinking tea may help strengthen the body’s defense system against infection（感染）．Doctors at Brigham and Women’s Hospital in Boston，Massachusetts，did the study．The team studied...
【单选题】Keeping taking drugs that prevent infection throughout the cold season will
A.
cure infection completely.
B.
become inexpensive in the long run.
C.
increase the risk of addiction to drugs.
D.
have more side effects than other choices.
【单选题】Eosinophile granulocyte is related to
A.
Allergic reaction
B.
releasing histamine
C.
Defence against bacterial infectio
D.
Produce immunoglobulin
E.
parasite infection
【简答题】American researchers say drinking tea may help strengthen the body’s defense system against infection. Doctors at Brigham and Women’s Hospital in Boston, Massachusetts, did the study. The team studied...
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