For decades, MayDay parades in Moscow have taken place under clear blue skies, aircraft having deposited dry ice, silver iodide and cement powder to disperse clouds.
几十年来，莫斯科的五月节游行都是在晴朗的蓝天下举行的，他们飞机上撒下干冰、碘化银和水泥粉来驱散云层。
In addition to cement, the concrete raw materials, including fly ash, mineral powder, silver stone and clay, remarkably affect the application performance of PCE.
除水泥外，混凝土原材料粉煤灰、矿粉、石粉和粘土对聚羧酸系减水剂的应用性能也有明显影响。
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