题目

It is common that many employees can't get the pay as they ______. A. have been promised                            B. are promising                 C. have promised                                  D. are promised 答案：A从如图所示的某气体反应的能量变化分析，以下判断错误的是 (　　) A．这是一个放热反应                      B．该反应可能需要加热 C．生成物的总能量低于反应物的总能量       D．反应物比生成物更稳定