conduct何时用复数Demand for.like coal and steel in declining.A.product B.products

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conduct何时用复数Demand for.like coal and steel in declining.A.product B.products
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conduct何时用复数Demand for.like coal and steel in declining.A.product B.products
conduct何时用复数
Demand for.like coal and steel in declining.
A.product B.products

conduct何时用复数Demand for.like coal and steel in declining.A.product B.products
这里应该是B;当表达意思为产品类别时,就需要用复数