What is a medical non-woven fabric? - 1 views
Medical application of non-woven fabrics in our life more and more widely, below small make up to you to introduce medical non-woven fabric, see below! Medical non-woven fabric is a kind of do...
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What are the power tools? The total value of the power tool industry reached 49.989 bil... - 0 views
In 1895, German Overtone produced the world's first DC electric drill. The shell is made of cast iron and can drill 4mm holes in the steel plate. Then a three-phase power frequency (50Hz) electric ...
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