大多数可以经非手术治疗的是（） A.瘢痕性幽门梗阻 B.胃十二指肠溃疡大出血 C.胃 发布时间：2017-08-07 12:45 │ 来源：www.tikuol.com 题型：单项选择题 问题： 大多数可以经非手术治疗的是（）A.瘢痕性幽门梗阻B.胃十二指肠溃疡大出血C.胃十二指肠溃疡急性穿孔D.十二指肠溃疡并球部变形E.穿透性十二指肠溃疡
题型：单项选择题 短文改错。At your school, who usually makes the decision to punish the student who is found cheat in an exam or getting into a fight? "The school authority, of course!" You would probably say. And in the No. 10 Middle School, a special student committee has the finally say. Wang Wei, who was made the president of the committee, told us that his school encouraged self-education and self-management between students. The committee deals with students who break away schoolrules. And it will collect opinions from the people concerned before handing out a formal opinion to the school authority. In most case, the school authority follows their opinions in the end. In this way students who are in charge of the committee feel more happy and free. 1. _____2. _____3. _____4. _____5. _____6. _____7. _____8. _____ 9. _____ 10. _____ 查看答案
题型：单项选择题 近年来，工业上用硝酸镁代替浓硫酸作为制取浓硝酸的脱水剂（以下数据均为溶质的质量分为数）．65%的硝酸（质量为M1）中加入72%的硝酸镁溶液（质量为M2）后蒸馏，分别得到97.5%的硝酸和60%的硝酸镁溶液（不含有硝酸）．若蒸馏过程中，硝酸、硝酸镁和水均无损耗，求蒸馏前的投料比M1/M2值为______．若蒸馏过程中，水的损耗占总质量（M1+M2）R的5.0%，则投料时，比值M1/M2应该______（填增大、减小或不变）． 查看答案