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【单选题】
构成传染病流行过程必须具备三个条件：A.
病原体数量、毒力、侵入途径
B.
传染源、易感人群和外周环境
C.
传染源、传播途径、易感人群
D.
病原体、人体、和它们所处环境
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【简答题】●Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries.Yet much had happened between.As was discussed before，it ...
【简答题】NPN包括哪些物质?测定NPN有何临床意义?
【简答题】●Comparisons were drawn between the development of television in the 20th century and the diffusion of printing in the 15th and 16th centuries.Yet much had happened between.As was discussed before，it ...
【简答题】何谓NPN?临床上测定NPN有何意义?
【简答题】对于NPN缓变基区晶体管，导出：
【简答题】非蛋白氮(non-protein nitrogen，NPN)
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