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【单选题】
传染病的流行必须具备的三个环节是( )。A.
潜伏期、前驱期、发病期
B.
潜伏期、发病期、免疫期
C.
病原体、传播途径、易感人群
D.
传染源、传播途径、易感人群
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反馈参考答案：
举一反三
【简答题】我国近代高层建筑的发展:1959年建成的()
【单选题】It was not until we had stayed together for a couple of weeks______we had a lot in common.
A.
did I find
B.
that I didn't found
C.
had I found
D.
that I found
【单选题】We had worked only one hour it began to rain so heavily that we had to put up our tent. [ ]
A.
before
B.
when
C.
after
D.
until
【单选题】We had to start at exactly the same time, so we had our watches ____.
A.
checked
B.
tested
C.
stabilized
D.
corrected
【简答题】在word2010文档编辑中,“剪切”、“复制”“粘贴”的快捷键分别是____和____
【简答题】毛石基础顶面宽度应比墙基地面宽度大()mm;梯形基础坡角应大于()度;阶梯型基础每阶高度不小于()mm,每阶挑出宽度不小于()mm。
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