题目内容
A zero-level marketing channel typically uses a wholesaler and a retailer.
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面部危险三角区的感染禁用热疗是为了防止：
Add-on services such as credit, delivery, installation, and repairs provided by the marketing channel are referred to as service backup.
病人，女性，60岁，腰肌劳损，行热疗。目的不包括：
Products such as heating and cooling systems are usually sold and maintained by the company or by franchised dealers.
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