《中华人民共和国安全生产法》 规定,生产经营单位的特种作业人员必须按照国家有关规定,经专门的安全作业培训,取得(),方可上岗作业
B
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AccordingtothepsychoanalystSigmundFreud,wisdomcomesfromthe_____ofmaturity.
Someanimalspantandsweattospeedevaporationofbodymoistureandthuscoolthemselves.
Morewindpowerstationswill____________tomeetthedemandforcleanenergy.