【简答题】
为什么规定液化石油气中C5及C5以上含量？
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答案
因为在常温常压下，C5以上烃类为液体，如果液化石油气中含有大量的C5及C5以上组分，在常温常压下使用时，这些烃类因不易汽化，而残留在容器底部，降低了液化石油气的质量，影响了正常使用。
解析
略
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