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It follows that the surroundings and natural environment of the uranium mine have not yet appreciably polluted by radioactive fallou... 二十多年來,對周圍環(huán)境和工人身體健康都未帶來危害。
Dcmonchy M Y,Fallou M J. Electrofusion joins PE pipe joints. Pipe Line Industry, 1990,73 (3) :43 90燃氣輸送用熱塑性壓力管材、管道和管件的規(guī)范標準.