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【单选题】
传染病流行过程的三个基本环节是指A.
传染源、传播途径、病原体
B.
传染源、传播途径、易感人群
C.
传染源、易感人群、病原体
D.
易感人群、病原体、传播途径
E.
以上都不是
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举一反三
【单选题】Directions: There are three passages in this part． Each passage is followed by some questions or unfinished statements． For each of them there are four choices marked A, B, C and D． You should decide ...
A.
critical
B.
questioning
C.
approving
D.
objective
【简答题】在AutoCAD中,系统默认的坐标系为 , 用户也可以根据需要定义 。
【简答题】运算电路如下图所示，已知三个输入量u 1 ，u 2 和u 3 与输出量u o 的关系满足u o =au 1 +bu 2 -4.2u 3 。试求系数a，b和电阻R 4 的值。
【单选题】Directions: There are three passages in this part. Each passage is followed by some questions or unfinished statements. For each of them there are four choices marked A, B, C and D. You should decide ...
B.
Most people can get more work done by working longer hours.
C.
Most Americans work 80 hours a week, and some work even longer.
D.
People can make more money by working longer hours.
【单选题】The author in the passage uses the following devices in his writing EXCEPT ______.
A.
questions
B.
narrative
C.
analogy
D.
comment
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