【单选题】The phrase of the year 2011, 'shang bu qi', ______ 'too delicate to bear a blow', reveals the public's sensitivity to personal and social problems.
【简答题】______ is a measure of heat flow through a material. It relates heat flow (the flow of heat energy per unit area, per unit time) to the temperature gradient, causing the heat to flow. A) Heatcapacity ...