we wish to introduce ourselves to you as a sate-owned corporation是主语
dealing exclusively in light infustrial goods是修饰a sate-owned corporation 的，表示是 专营轻工产品 的公司
we are introducing ourselves as one of the lading exporters of the same line of business
introducing是一般现在时，表示一个持续进行的状态，所以是are introducing，be+v-ing结构
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