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What is the international implementation standard of carat pipe?

Carat pipe is now widely used in urban pipeline construction. Compared with the traditional steel pipe, this pipe can withstand the weight pressure of larger caliber, and it is safe and environmentally friendly. In the operation process, it can achieve anti-corrosion and zero penetration. According to relevant data statistics, the seismic index of domestic and …

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What are the limitations of CT imaging and spirometry?

STUDY OUTLINE: Chronic obstructive pulmonary disease (COPD) is defined as airflow limitation on spirometry¬†with an FEV1/FVC ratio less than 0.7 or less than the lower limit of normal. However, patients with preserved lung function may still experience respiratory symptoms, exacerbations, and accelerated decline in lung function similar to COPD. It is also understandable that there …

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