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Also known as "digital marketing" and "e-marketing," social media marketing has purpose-built data analytics tools that allow marketers to track how successful their efforts are.()

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Cold calling is the marketing process of approaching prospective customers or clients—typically via telephone, by email or through making a connection on a social network—who were just expecting such an interaction.()

Traditional forms of marketing such as newspaper and television advertising, direct mail and cold calling integrate well with the powerful medium of the Internet and have become more and more effective as a result.()

何谓星云和星际物质？星云怎样分类？银河系的形状和结构有何特点？

织女星（天琴座α）的视星等为0.1，若其距离增加为10倍，这时，它的星等将是几等？肉眼还能看到它吗？某恒星的视星等数值比绝对星等数值大5等，则该恒星的距离应为多少秒差距？