air purification technique
air purification technique
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Hepatitis A can be contracted through the following routes except ( ) . A、waterB、stoolC、foodD、air
The condensers located in various stages of a flash evaporator are cooled by( ).A.distillateB.seawaterC.brineD.air
During the SARS period,it is especially important to ventilate the room.A: dustB: cleanC: removeD:air
Such problem （）air, water, and noise pollutions are becoming more and more serious in some big cities.AlikeBasCofDabout
technique的中文意思是？A．技术B．性质，特色C．化学D．平衡的