To get well, ( ).A、we are going to give the patient a chemical treatmentB、the patient needs a chemical treatmentC、the doctors suggest a chemical treatment of the patientD、a chemical treatment is necessary
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chemical sterilization
chemical sterilization technology
International Certificate of Fitness for the Carriage of Dangerous Chemicals in Bulk shall be carried on board by ______．A.chemical tankers constructed on or after 1 July 1986B.chemical tankers constructed before 1 July 1986C.All chemical tankersD.oil tankers of 150 gross tonnage and above
Which of the following may be used in cleaning up an oil spill without the permission of governmental authorities ________．A.Straw and Skimmers onlyB.Skimmers and Chemical dispersants onlyC.Straw and Chemical dispersants onlyD.Straw，Skimmers and Chemical dispersants
______, as the chemical extinguisher agent, should be used for an electric fire.A.dry chemical or foamB.foam or soda acidC.carbon dioxide or foamD.carbon dioxide or dry chemical
______is not a process of weathering of the oil spilled in the sea water.A.BiodegradationB.DissolutionC.Cleaning up by crew with skimmersD.Oxidation including photooxidation
