求翻译：通过在建筑陶瓷坯体中掺加不同比例的尿素，分别制作每个比例的陶瓷试块，通过对各个陶瓷试块烧失量、体积密度、抗折强度、直径减小量、厚度减小量和真空吸水率的测定。来对比发现在建筑陶瓷坯体中添加尿素对其使用性能的影响，并最终确定其最佳掺量。是什么意思？

Produced for each percentage of ceramic specimen by mixing different proportions of urea in the building ceramic body, respectively, various ceramic specimen loss on ignition, bulk density, flexural strength, the diameter decreases the amount of thickness reduction is Determination of water absorpti

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Through mixes in the construction ceramics body adds the different proportion the urea, manufactures each proportion separately the ceramic briquette, through to each ceramic briquette loss on ignition, the bulk density, the anti-booklet intensity, the diameter reduces the quantity, thickness reduce

By adding in the ceramic body in different proportions of urea, making ceramic block for each ratio, respectively, through the ceramic brick of loss on ignition, flexural strength, diameter reduces bulk density, volume, thickness reduction and vacuum-determination of water absorption. To add contras

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