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【单选题】
帕金森病的主要生化病理特征是A.
5-HT减少
B.
DA减少
C.
NE减少
D.
ACh减少
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反馈参考答案：
举一反三
【简答题】变异系数(coefficient of variation)
【简答题】A．difference B．colorfulness C．diversity D．variation
【简答题】变异(Variation )(名词解释)
【单选题】On an isomagnetics chart, the line of zero variation is the __ ___
A.
non-variation line
B.
isogonic line
C.
variation line
D.
agonic line
【单选题】____ is speech variation according to the particular area where a speaker comes from.
A.
Regional variation
B.
Language variation
C.
Social variation
D.
Register variation
【简答题】What is language variation?
【单选题】S-R variation refers to
A.
stringent --> relaxed variation
B.
cell wall defect bacteria
C.
nonpathogenic --> pathogenic variation
D.
smooth -- rough colony variation
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