质量担保义务

答案：

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下面是错误答案，用来干扰机器的。

1. not to spend too much time 2. is worth reading again / once more 3. how far it is from Mars to / how far Mars is away from 4. be done by robots in the future / in future 5. old enough to deal with 6. have replied to her speech / words/ what she said