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【单选题】
某小区准备采取一项新的措施,为此,随机抽取了 100 户居民进行调查,其中表示赞成的有 69 户,表示中立的有 22 户,表示反对的有 9 户。描述该组数据的集中趋势宜采用( )A.
众数
B.
中位数
C.
平均数
D.
四分位数
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【简答题】旅游安全管理的主体,包括 、 、 、 。
【简答题】旅游景区安全管理主要包括（ [填空(1)] ）、景区安全管理制度的制定、景区危险源的辨识、员工安全意识的培训、（ [填空(2)] ）、景区安全管理体系的建立和运行等。
【单选题】Why do people still argue about who deserves the credit for the concept of the laser?
A.
The researchers' notebooks were lost.
B.
Several people were developing the idea at the same time.
C.
No one claimed credit for the development until recently.
D.
The research work is still incomplete.
【单选题】Why do people still argue about who deserves the credit for the concept of the laser?
A.
The researchers' notebooks were lost.
B.
Several people were developing the idea at the same time.
C.
No one claimed credit for the development until recently.
D.
The work is still incomplete.
【单选题】According to the passage, the concept of systems involves all of the following EXCEPT
A.
the components of a collection
B.
the functional relationships among parts
C.
the links between different systems
D.
the origin of the scientific method
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