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问题
单项选择题
以死亡为终止事件的随访资料分析中,应选用的指标是()
A.发病率
B.患病率
C.出生率
D.生存率
E.死亡率
答案
参考答案:
D
选择题
Since the world heritage list was first created in 1972, many more sites _____ it.
A. have added up to
B. are added to
C. have been added up to
D. will be added up to
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问答题 论述题
论述标志的分类、特点以及标志设计的基本程序。
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