| http://www.w3.org/ns/prov#value | - Moreover, the usage of it is in connecting pipe line and keep its leakproofness; convenient for replacing pipe line; easy to separate and check the situation of pipe line; easy to seal pipe line, such as oil, petroleum, gas, chemical industry, nuclear power station, water and nuclear power construction, shipbuilding, food manufacturing, construction, shipbuilding, paper making, medicine
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