所述系统包括：第一PE设备和第二pe设备。
The system comprises: a first PE device and a second PE device.
所述系统包括第一光源、第二光源和光电检测器。
The system comprises a first light source, a second light source and a photodetector.
所述系统包括用于计量一定体积组分的至少一个体积定量给料装置。
The system comprises at least one volumetric dosing unit for metering a volume of the components.
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