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【单选题】
1) Why do different types of libraries exist according to the passage?A.
To offer different services to different people.
B.
To serve all members of the general public.
C.
To satisfy different needs of all potential users.
D.
To attract more users to use their resources.
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【单选题】有关“医院感染”的叙述，哪一项是错误的：
A.
是指在医院接受诊断、治疗期间发生的一切感染
B.
感染对象主要是患者
C.
主要由外源性致病微生物引起
D.
大多由单一病原体引起
E.
病原菌常具有耐药性
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