400-600-1123
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答案：
C
题干：先讲
低温杀菌消毒原理，接着说QF公司的净水系统是基于同样的原理，同时考虑到该系统只能在低温环境下工作，所以市政部门仍然需要维持传统净水系统。
题目：下面哪个选项为“市政部门在维护传统净水系统的同时会购买QF的净水系统”这个预测提供了最强有力的论据。
分析：题干和问题中的关键对象是QF的净水系统，关键属性是低温条件下可杀菌消毒。题目考察的逻辑方向是补充型引入他因正向逻辑，所以答案的逻辑方向一定是讲QF净水系统的正面属性同时要考虑到维持旧系统的必要性。
A选项引入无关对象；
B选项同样讨论无关对象，仅仅考虑到旧系统需要被更换无法说明是否需要采购QF的新产品；
C选项正确；
D选项：一方面提到天气炎热的情况下无法使用新系统，一方面讨论QF系统在空闲时维护成本很低；
E无关对象的无关属性。 
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