To build a system for low-carbon economic development, the ways include ( ). A: building a mechanism for development of low-carbon energy technology B: building a mechanism for eco-environmental compensation C: building a mechanism for certification of low-carbon products D: building a mechanism for constraining carbon emission

Cutting carbon dioxide emission by 60% will ______. A: be reached when low-income countries agree to reach an agreement B: cause a collapse of the world economy C: reduce in a large amount the content of CO2in the atmosphere D: help realize a stabled world economy

Carbon chains can rotate around a double bond (carbon=carbon or C=C).

What caused the deposits A: The hydrochloric acid broke the carbon bonds in tile carbon dioxide, B: The magnesium oxide broke the carbon oxygen bonds in the carbon dioxide. C: The burning magnesium broke the carbon oxygen bonds in the carbon dioxide. D: The gas collection method broke the carbon-oxygen bonds in the carbon dioxid

In this research at Columbia University, Charles Townes worked with ______. A: stimulated emission B: microwaves C: maser D: stimulated emission and microwaves