Two technicians are discussing retrofitting cfc-12 systems to hfc-134a standards. technician a says that the process doesn't take long but that mineral oil must be added before the retrofit is complete. technician b says that 50 ounces of cfc-12 should be replaced with 50 ounces of hfc-134a. who is correct?

50 on a scale of one to ten, how cute is this dog? (for a science project i need data)

What best describes the portability characteristic of money?

The biome pictured above is found in areas such as kenya and south africa. the land is grass-covered with very few trees and gazelles and other grazers are common here. why does this biome have a low population of trees? a) large grazing animals destroy the trees. b) it is a deforested rainforest with poor soil. c) it has high temperatures and low precipitation. d) it has a long rainy season followed by flooding.