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January 5, 2017 at 12:25 pm #11081
Dotted lines often indicate an optional component or configuration, since diagrams/service manuals often cover several models of an appliance, and not all models will have all features. (See the diagram for Q. 7, for example).
For the purpose of question 8, however, it doesn’t influence the answer and you can ignore it. The thickness of the lines also have no meaning for this question.