题目

Mary is really good at taking notes in class. She can ________ almost every word her teacher says. A. put out                              B. put down C. put away                             D. put together 答案：B在1L的密闭容器中充入2mol N2和7mol H2，发生反应N2+3H2=2NH3，保持其他条件不变，相同时间内测得NH3的浓度与温度的关系如图所示．下列叙述不正确的是A.该反应是放热反应B.a、c两点对应的压强 Pa<PcC.温度为T1时，N2的平衡转化率为50%D.温度为T1时，再加入1mol N2和1mol NH3，平衡向正反应方向移动