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【单选题】
原子吸收光谱法通常采用空心阴极灯作光源,其构造是A.
待测元素作阳极,铂丝作阴极,内充惰性气体
B.
待测元素作阳极,棒作阴极,内为真空环境
C.
待测元素做阴极,铂网作阳极,内为真空环境
D.
待测元素做阴极,棒作阳极,内充惰性气体
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举一反三
【判断题】recently, six men died of severe reactions to an experimental drug for leukemia.
A.
正确
B.
错误
【单选题】______ is the effect that is caused by a drug and is different from the drug's intended effect.
A.
Side effect
B.
Drug allergy
C.
Drug interaction
D.
Nourishment
【单选题】Drug Abuse 1 The term 'drug abuse' most often refers to the use of a drug with such frequency that it causes physical or mental harm to the user or impairs social functioning. Although the term seems ...
A.
Patterns of drug abuse
B.
Treatment
C.
Drug testing in the workplace
D.
Classification of psychoactive drugs
E.
Definition of drug abuse Paragraph 1 ______.
【单选题】As to the issue of drug approval, ______.
A.
to judge whether a drug is safe enough should rely on objective measures
B.
drug companies usually study for years to prove the safety and effectiveness of a drug
C.
drug companies prefer surrogate endpoints in the process of drug approval because F.D.A.encourages them to do so
D.
drug companies rely heavily on surrogated endpoints because this way of measurement takes less time and money
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