In the summer, it is hot and hot, beware of "air conditioning disease"

When the heat came, air-conditioning became an indispensable tool for many people to live and work. However, the cold, asthma, joints, back, and spinal pains were also on the rise. Heze Yellow River Orthopaedic Hospital experts reminded that the use of air conditioning is not easy to induce disease. Experts say that long-term air conditioning, not only will suffer

Grating-based External Cavity Tunable Laser

Grating-Based External Cavity Tunable Laser,Red Grating Laser,Laser Grating Reflection,Grating Reflector Laser

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