"control"的搜索结果

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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stainless steel outdoor grills temperature control knobs

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infrared remote control

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blue remote control motherboard

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remote control motherboard

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colorful rubber bands from the remote control

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