单项选择题Soccer's World Cup is promoted aggressively to both companies and fans. This is an example of marketing a(n) ________.
单项选择题根据《石油化工企业设计防火标准(2018年版)》(GB50160-2008),布置在爆炸危险区的在线分析仪表间内设备为非防爆型时,在线分析仪表间应()。