一定条件下,将一定量的A、B、C、D四种物质,置于密闭容器中发生如下反应: m A(s)+ n B(g) p C(g)+ q D(g) △ H 达到平衡后,测得B的浓度为0.5 mol/L。保持温度不变,将密闭容器的容积扩大到原来的两倍,再次达到平衡后,测得B的浓度为0.3mol·L - 1 。当其它条件不变时,C在反应混合物中的体积分数( )与温度( T )、时间( t )的关系如图所示。下列叙述正确的是
【单选题】7 Dawson Manufacturing produces and sells DVD players and is planning to expand sales internationally. Dawson has narrowed down the list of potential countries to India and Guatemala. A Dawson manager...
A.
determining average wages
B.
calculating future inflation rates
C.
reviewing the countries' dependence on steel imports
D.
examining the sales history of flat-screen televisions