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护士给病人使用热水袋一段时间后，发现以下何种现象应立即停止使用：
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What are marketing channels? Briefly explain some of the different types of intermediaries.
Marketing channels are sets of interdependent organizations participating in the process of making a product or service available for use or consumption. They are the set of pathways a product or service follows after production, culminating in purchase and consumption by the final end user. Some intermediaries — such as wholesalers and retailers — buy, take title to, and resell the merchandise; they are called merchants. Others — brokers, manufacturers' representatives, sales agents — search for customers and may negotiate on the producer's behalf but do not take title to the goods; they are called agents. Still others — transportation companies, independent warehouses, banks, advertising agencies — assist in the distribution process but neither take title to goods nor negotiate purchases or sales; they are called facilitators(促进者).
Briefly explain the various service outputs that marketing channels produce.
Explain the three distribution strategies based on the number of intermediaries.
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