The Holy Roman Emperor Charles V helped the Pope in the movement of Catholic Counter－Reformation。（)
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An important product of vernacular romance literature was the Romance of the Rose。（)
什么是烟、风道的摩擦阻力？什么是局部阻力？什么是管束阻力？
Legends have it that the Garden of Eden situated on the Mesopotamian plain。（)
什么平衡通风中需要又可能保持炉膛负压20-50pa？除平衡通风外，还有什么通风系统能维持负压？
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