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#Oral bacteremias after a tooth extraction are:
O A now considered as a myth
O B. generally transient & last for less than one hour
O C. present at least for 6 hours
O D.rare with Streptococci Viridans
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Rainwater harvesting is collecting the run-off from a structure or other impervious surface in order to store it for later use. Traditionally, this involves harvesting the rain from a roof. The rain will collect in gutters that channel the water into downspouts and then into some sort of storage vessel.
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