4.5.3 玻璃限流管（GLASS CRITICAL ORIFICE）及过濾用石英棉（QUARTZ WOOL）。 4.5.4 零点及全幅测试：检测误差小于±2.5%FS。
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Quartz Wool was made from high-purity quartz, extremely low in metallic oxide impurities.
试映羊毛采用高纯石英制成，非常适用于进样口衬管。
Quartz Wool - Made from high-purity quartz, extremely low in metallic oxide impurities.
采用高纯石英制成，非常适用于进样口衬管。
The matrix is one of river sand, rock wool, quartz sand and vermiculite or the composition of more than one of the substances.
基质是河沙、岩棉、石英砂、蛭石的一种或一种以上组合。
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