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制备麻疹减毒活疫苗时,选择( )的鸡胚:
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A distribution channel includes distributors, wholesalers, retailers, and agents that display, sell, or deliver a physical product or service to a buyer or user.
麻疹减毒活疫苗是用麻疹病毒减毒株接种____细胞。
麻疹减毒活疫苗是经培养、收获病毒液,加入适宜____后冻干制成的生物制品。
In the statement, "Volvo develops its cars for buyers to whom safety is a major concern, positioning the vehicles as the safest a customer can buy," buyers to whom safety is a major concern is the target market.
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