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【单选题】
目前流行病学病因模型发展的最高形式是A.
流行病学三角模型
B.
疾病因素模型
C.
轮状模型
D.
病因网络模型
E.
以上都是
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反馈参考答案：
举一反三
【简答题】与下列掩码相对应的网络前缀各有多少位? (1)192．0．0．0；(2)240．0．0．0；(3)255．224．0．0；(4)z55．255．255．252。
【简答题】Fill in the blanks with suitable words according to the meanings in the brackets. 1. His father used to be a ________ (high in rank or position) officer in the Liberation War. 2. Before the speaker be...
【简答题】如何把一个Word的样式复制到另一个文档中？
【单选题】His father began to work ____ he was seven years old.
A.
as old as
B.
as early as
C.
since
D.
while
【简答题】网页文档对标签＜h2＞定义了蓝色文字的内置样式，文档体中用text属性定义文字颜色。浏览器将对标题2应用样式规定的蓝色显示，而按文档体规定的红色显示标题3与段落的内容。
【单选题】The doctor suggested she ______ in bed, while her smiling face suggested there ______nothing serious.
A.
stay, was
B.
stayed, should be
C.
staying, was
D.
stay, should be
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