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入院后为进一步明确诊断，哪项检查最有意义
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听力原文： A United Nations agency has issued an urgent appeal for more international aid to help stop an upsurge of desert locust swarms from becoming a plague. The Food and Agriculture Organization says the upsurge is the worst in fifteen years. Large swarms have moved from their spring breeding areas in northwest Africa to Mauritania, Senegal and Mali. The organization says the locusts are likely to spread as far as Niger and Chad, and could even reach Darfur in western Sudan. A BBC science correspondent says major insecticide spraying programs have been initiated, some funded by western donors, but clearly they haven't worked.
What plague are some African countries facing？
企业决定同时为几个子市场服务,设计不同的产品,并在渠道、促销和定价方面都加以相应的改变,以适应各个子市场的需要。这种营销战略称为()。
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