Oxit nào dưới đây là oxit lưỡng tính

BaO
Fe2O3
CuO
Al2O3

6. what does the symbol ah stand for? o one calorie given off by a reaction the specific heat of a substance the heat capacity of a substance the heat of reaction for a chemical reaction

What happened to the amount of carbon dioxide in the atmosphere from 2010–2017?

A40 kilogram skier starts at the top of a 12 meter high slope. at the bottom, she is travelling 10 meters per second. how much energy does she lose to friction