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First came Tetris, then Doom – and now a bare-bones Linux instance that boots inside a PDF. Yes, the humble PDF – thanks to its ability to run limited JavaScript – has been coaxed into booting a ...

简介：在水泥生产与质量控制过程中，准确测定水泥中二氧化碳的含量至关重要。二氧化碳含量不仅影响水泥的化学组成和物理性能，还与水泥的生产工艺、生产成本以及环境影响密切相关。