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【单选题】
近年来，国内空调产业的销售额达到前所未有的水平。不同企业生产的空调在技术和质量等方面的差异不明显。空调生产企业的主要战略径是提高效率、降低成本。按照产品生命周期理论，目前国内空调产业所处的阶段是( )。A.
成长期
B.
成熟期
C.
衰退期
D.
导入期
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