sound-proof concrete

The sound velocity of the concrete with waste slag was tested before and after freezing and thawing in water, 3.5% NaCl and 3.5% NaCl+ 5.0 Na_2SO_4 solutions.

用超声波法检测了掺废渣混凝土在水溶液、3.5%氯化钠溶液以及3.5%氯化钠与50%硫酸钠复合溶液中冻融前后的声速变化。

Test research on sound-performance steel slag concrete with large admixing amount

大掺量高性能钢渣混凝土的试验研究

That may sound like hyperbole, or abstract nonsense . So let's get concrete.

这似乎听上去很夸张, 或者就像抽象的胡言乱语.

This article discusses the teaching problems in classroom about course of sound mind education for university students, considering that course should constitute definite and concrete teaching objectives, choosing teaching contents according to actual demand of university students and discussing proper teaching modes and methods.

探讨了大学生心理健康教育课的课堂教学问题，认为该课应该制定明确具体的教学目标，根据大学生的实际需要选择教学内容，探讨适当的教学方式、方法。

With aerated concrete slab as a template, save a lot of temporary templates to speed up the construction cycle, better insulation, heat insulation, sound insulation.

用加气混凝土板作为模板，节省了大量临时性模板，加快了施工周期，有较好的保温、隔热、隔声性能。