题目

任务型阅读 A rejection letter is one of those letters that are not very easy to write.. For example, organizations usually have to send rejection letters to applicants they cannot hire. So how to write a rejection letter? Make the words professional and proper What matters most in a rejection letter is the professional tone and wording. Instead, your choice of words should make the reader feel that he or she would do the same thing if they were in your place. Keep it clear and simple . Nobody likes to read a long, winding rejection letter. Therefore, it is better to deliver the message of 在2 L密闭容器内，800℃时反应：2NO(g)＋O2(g) 2NO2(g)体系中，n(NO)随时间的变化如表： 时间(s) 0 1 2 3 4 5 n(NO)(mol) 0.020 0.01 0.008 0.007 0.007 0.007 (1)800℃，反应达到平衡时，NO的物质的量浓度是__________；升高温度，NO的浓度增大，则该反应是________(填“放热”或“吸热”)反应。 (2)如图中表示NO2变化的曲线是________。用O2表示从0～2 s内该反应的平均速率v＝________。 (3)能说明该反应已达到平衡状态的是________。 a．v(NO2)＝2v(O2)       b．容器内压强保持不变 c．v逆(NO)＝2v正(O2)  d．容器内密度保持不变 (4)能使该反应的反应速率增大，且平衡向正反应方向移动的是________。 a．及时分离出NO2气体  b．适当升高温度 c．增大O2的浓度        d．选择高效催化剂