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by。考点:固定搭配。分析句子结构可知，该处缺少副词短语修饰动词discovered。该句句意为“制造商通过反复试验发现……”，而且短语by trial and error意为“通过反复试验”，符合句意，故答案为L项。
by。考点:固定搭配。分析句子结构可知，该处缺少副词短语修饰动词discovered。该句句意为“制造商通过反复试验发现……”，而且短语by trial and error意为“通过反复试验”，符合句意，故答案为L项。
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