Feedback laser which generates narrow band light source for the Optical fiber gas sensor is too expensive to be used in engineering.
但由于产生窄带光源的反馈式激光器造价很高，因此没能够得到实际应用。
Feedback laser which generates narrow band light source for the Optical fiber gas sensor is too expensive to be used in engineering.
但由于产生窄带光源的反馈式激光器造价很高，因此没能够得到实际应用。
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