Rigid polyurethane foam is a polymer thermosetting heat preservation material, heat conduction coefficient 0.024 W / (m?

聚氨酯硬泡是一种高分子热固性保温材料，导热系数0.024 W/（m?。

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Besides, the relations between variance ratio and correlation coefficient and between W-K statistics and correlation coefficient are found.

此外，找到了方差比，W - K统计量与相关系数之间的精确关系。

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The coefficient curves of R&D on technical progress show oblique "W" type, but on the whole, the economic benefits generated by R&D will get better and better.

研发投入对技术进步的系数变化曲线表现出斜向上“W”型，但从整体上看研发投入所产生经济效益会变得越来越好。

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