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【多选题】
影响群体凝聚力的因素有()。
A.
群体的人数
B.
外部环境的变化
C.
成员的认同感
D.
领导的权威性
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【单选题】Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health community needs now is a human vaccine for the bird flu pandemic sweepin...
A.
it has strong side effect to the elderly.
B.
it may turn ineffective in a short period.
C.
it is useless in pring the virus.
D.
it hasn’t been tested in humans.
相关题目：
【单选题】Animal studies are under way, human trial protocols are taking shape and drug makers are on alert. All the international health community needs now is a human vaccine for the bird flu pandemic sweepin...
A.
it has strong side effect to the elderly.
B.
it may turn ineffective in a short period.
C.
it is useless in pring the virus.
D.
it hasn’t been tested in humans.
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