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58。平板收集器的组件是什么？a) Flat box, a plate with reflective coating and fluid circulation passageways, an opaque cover, a circulating fluid b) Flat box, a dark coloured plate with fluid circulation passageways, an opaque, a circulating fluid c) Flat box, a dark coloured plate with fluid circulation passageways, a transparent cover d ) Flat box, a dark coloured plate fluid circulation passageways, a transparent cover, a circulating流体
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