混凝土中以下何项叙述为正确（） A.水灰比愈大徐变愈小 B.水泥用量愈多徐变愈小 C 发布时间：2020-04-20 11:43 │ 来源：www.tikuol.com 题型：单项选择题 问题： 混凝土中以下何项叙述为正确（）A.水灰比愈大徐变愈小B.水泥用量愈多徐变愈小C.养护环境湿度愈大徐变愈大D.骨料愈多徐变愈小
题型：单项选择题 完形填空 Big schoolbags have been a serious problem for students for a long time.Maybe your schoolbag is too __26__ to carry, and it troubles you a lot __27__ you want to find a book out to read. Now an etextbook will __28__ you. It is said that etextbooks are going to be __29__ in Chinese middle schools.An etextbook, in fact, is a small __30__ for students.It is much __31__ than a usual schoolbag and easy to carry. Though it is as small as a book, it can __32__ all the materials (材料) for study.The students can read the text page by page on the __33__， take notes with the pointer (屏写笔). Or even “__34__” their homework to their teachers by sending emails. All they have to do is to press a button. Some people say etextbooks are good, but some say they may be __35__ for the students' eyes. What do you think of it? 26.A.light 27.A.till 28.A.trouble 29.A.used 30.A.TV 31.A.heavier 32.A.hold 33.A.blackboard34.A.find out 35.A.helpful B. heavy B. after B. preventB. kept B. radio B. lighterB. build B. desk B. hand inB. famous C. useful C. before C. help C. inventedC. pen C. cheaper C. discoverC. screen C. get backC. good D. comfortable D. when D. understand D. lent D. com puter D. brighter D. practice D. card D. give back D. bad 查看答案
题型：单项选择题 患者，男，30岁，阵发性心悸2年。每次突然发生，持续0.5～1h。查体：HR200/min，律齐，心电图示QRS波群正常，P波不能明确查见，诊断为A．心房颤动B．窦性心动过速C．心房扑动D．阵发性窦性心动过速E．阵发性室上性心动过速 查看答案
