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: China reviews draft law revision to strengthen guardian resp
BEIJING, Oct. 13 (Xinhua) -- Chinese lawmakers on Tuesday began reviewing a draft revision of the...

: Ferry services suspended, schools closed in south China as t
Photo taken on Oct. 13, 2020 shows ships at Xingang port in Haikou, south China...

: powered smart communities ensure more comfortable life for r
The application of a new generation of information technology such as the Internet of Things, clou...

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压缩机和真空泵性能可靠、品质优良、安静环保、体积小巧且价格实惠，用户遍及国内外，其已广泛地应用于家用医用制氧机和牙科医疗实验设备、真空自动化设备、印刷晒版机械、真...

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机械真空泵是真空获得设备之一,它因转子弹簧的断裂或油的木洁,在转子和定于上划出深浅不一的沟槽,结果容积泵的高压区向低压区产生返流,工作性能迅速恶化,甚至报废不能再用。...