for specific product categories
对于特定的产品类别
以上为机器翻译结果，长、整句建议使用 人工翻译 。
For the main pressure-bearing parts of equipment in categories II, III and IV, this must take the form of a certificate of specific product control.
即二类，三类，四类的压力容器中的主承压部件，必须经过特定的产品控制型式，然后获得相关的证书。
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The final strategy will be different for every company because it must depend on a company's specific targeted consumers, product categories, sales and distribution system, marketing models, competitors, and economics.
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