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【单选题】
某医学资料数据大的一端没有确定数值,描述其集中趋势适用 的 统计指标是A.
均数
B.
中位数
C.
几何均数
D.
百分位数
E.
频数分布
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【简答题】阴离子聚合的机理特点是:
【简答题】阴离子聚合机理的特点是（）
【单选题】听力原文： The International Olympic Committee is releasing an evaluation report on the five cities bidding to stage the 2012 Olympic Games. The report won't rank the cities but it is intended to guide the...
A.
financing
B.
weather
C.
transport
D.
public support
【单选题】听力原文：You know what? I've got to finish that evaluation report for the board meeting next week. A 10-page report within the week! There goes my social life this weekend. (23)
A.
I cannot finish the report in time.
B.
I hate to join in social activities this weekend.
C.
I have to work extra time over the weekend.
D.
I will not attend the board meeting next week.
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