若加氢的床层温度急升难以控制时可大量打入冷氢,控制床层温度不超过400度。 发布时间:2020-11-29 23:32 │ 来源:www.tikuol.com 题型:判断题 问题: 若加氢的床层温度急升难以控制时可大量打入冷氢,控制床层温度不超过400度。
题型:判断题 (2014·山东省实验中学一模)—Have you graduated from Shandong University?—Yes.I________there for 4 years.A.studied B.have studiedC.had studied D.have been studying 查看答案