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Methods A study of randomized double - blind contrast test was performed with piracetam as contrast medicine.
方法采用随机双盲对照试验,对照药物为吡拉西坦.
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Describe the feasibility of replacing acetylene by JZSH industrial fuel gas in cutting by contrast test.
通过对比试验,阐述了JZSH工业燃气在焊割方面取代乙炔的可行性.
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