"control"的搜索结果

control health worker gripping a hand held augur and next to him atop a tree stump

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this image depicts a pakistani malaria control worker undergoing skin patch testing

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these were the tools used by the pakistani malaria control team when they were mixing malathion powder

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these malaria control workers whod been spraying malathion to combat mosquito populations

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plate streaked with dried malathion because cookware was sprayed in an effort to control mosquitoes

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malaria control worker mixing malathion spray powder without covering his exposed skin

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malaria control worker is demonstrating malathion spraying technique

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close up face of pakistani malaria control worker undergoing skin patch testing

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workers practicing vector control by digging a drainage ditch in order to help disperse standing water

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this niger based primary hc mobile unit was assisting in the control of sleeping sickness

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stearman bi plane is spraying an insecticide during malaria control operations in savannah ga

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group of dead adult mosquitoes scattered uniformly throught the field of view during a vector control study

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smallpox eradication and measles control programs west africa

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the control room at the water intake center in tirupur southern india

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national birth spacing programs in indonesia helps families to take more control of their lives

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