"control"的搜索结果

erosion control efforts with wooden fence in sand

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erosion control efforts

标签: erosion,control,efforts 浏览: 1

erosion control rocks in water to prevent erosion

标签: erosion,control,rocks,in,water 浏览: 1

a water control structure gauge in a wetlands

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water control structure

标签: water,control,structure 浏览: 1

wetlands weir water lever control

标签: wetlands,weir,water,lever,cont 浏览: 1

blooming during the month of march on the grounds of the centers for disease control headquarters in atlanta georgia

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growing on the grounds of the centers for disease control headquarters in atlanta georgia

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captured in niger west africa during the smallpox eradication and measles control program

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photograph made during smallpox eradication and measles control program in niger w africa

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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

标签: these,malaria,control,workers, 浏览: 1

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

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