Technician a says that aluminum should be repaired in a separate area from steel. Technician b says that a vacuum attachment should be used when sanding aluminum. Who is right?.

Explanation for basic character?

Compare and contrast the bohr model and the electron cloud models of the atom.

Which ocean zone has the most abundant primary producer and why a) the abyssopelagic zone ,du to the absence of light and cold water temperatureb) the bathypelagic zone, due to the absence of light and cold water temperaturec) the mesopelagic zone ,due to uts high light availability and warm water temperature d) the epipelagic zone,due to its high light availability and warm water temperature